The twelve tense system in English - an overview

Not everyone agrees on what comprises a tense. It is common to talk about present, past and future tenses, but some people think a tense must involve inflection (or morphological change), that is a change in the form of the verb itself, as in Latin and many European languages, so they recognise only two tenses - past and present. On the other hand, one early grammar book talked of six tenses.

In EFL/ESL we usually work on the basis that a tense combines a time (present, past or future) with an aspect (simple, continuous, perfect simple or perfect continuous). This gives us twelve active tenses. In theory we could also have twelve passive tenses, but in practice, only eight are used.

Although I will be talking a bit about individual tenses, my main aim here is to show how, in this way of looking at things, all twelve tenses fit into a neat, easy to understand scheme.

What are tenses

Some dictionaries define tenses as simply being about time:

any of the forms of a verb that may be used to show the time of the action or state expressed by the verb (Oxford Advanced Learner's Dictionary)

a category of the verb or verbal inflections, such as present, past, and future, that expresses the temporal relations between what is reported in a sentence and the time of its utterance (Collins)

Others add a bit more:

a set of forms taken by a verb to indicate the time (and sometimes also the continuance or completeness) of the action in relation to the time of the utterance (Oxford Dictionaries Online)

any of the forms of a verb that show the time, continuance, or completion of an action or state that is expressed by the verb (Longman Dictionary of Contemporary English)

The way we talk about tenses in EFL/ESL, and the way I'll be discussing them in this post, is more in line with that second set of definitions.

Introductory notes

• Some people prefer to call future tenses future forms, but for the sake of consistency, and to show the close relationship between certain future forms and their past and present equivalents, I've kept the term tense throughout.
• What I refer to as continuous tenses here are also sometimes called progressive tenses.
• This way of categorisation is designed for teaching foreign learners. Linguists and other grammarians may have other needs and so look at tenses differently. There's a link to Glottopedia at the bottom for the linguistics angle. On the other hand, I strongly believe that this system would also be of benefit in teaching young native speakers about their language.

The five verb forms in English

English has five verb forms. That's not a lot compared with many languages. Thanks to the use of auxiliary verbs, also known as (aka) helping verbs, we can construct all our tenses from just these five forms. And in many verbs two of these forms are the same; and in a few verbs, even three of the forms are the same.

The only exception to this is the verb to be.

Form	AKA	Regular	Irregular 1	Irregular 2	Irregular 3
1st form	base form	work	have	write	put
2nd form	past form	worked	had	wrote	put
3rd form	past participle	worked	had	written	put
-ing form	present participle / gerund	working	having	writing	putting
3rd person singular present simple		works	has	writes	puts

In traditional grammar, the first three forms and sometimes the -ing form are often known as the principal parts of the verb.

The base form is that found in dictionaries and gives us:

• the infinitive
• 1st form
• the imperative

Auxiliary verbs

As I said, we form the tenses with the use of auxiliary (or helping) verbs:

• primary auxiliary verbs
  • do - in present and past simple (negatives and questions only)
  • be - in continuous tenses
  • have - perfect tenses

A reminder of how the primary auxiliaries are used

• Present and past tenses are formed with the primary auxiliaries do, be, have
• Future tenses are formed with a combination of the modal will and the primary auxiliaries be and have
• In simple tenses, the primary auxiliary do is usually only used in questions and negatives

Modal auxiliaries

There is also a group of verbs known as modal auxiliaries (or modals):

• modal auxiliary verbs
  • will, would, can, could, shall, should, may, might, must, ought to

These are used for adding modality (possibility, obligation, probability etc) rather than for forming tenses, except for will, which is used to form future tenses. We'll have a quick look at modals at the end of this post.

The twelve Active tenses

Exercise 1 - Complete each sentence by entering the verb write in one of the five verb forms.

Present
Simple - 3rd person sg	I writewrotewrittenwritingwrites lots of emails every day. She often writewrotewrittenwritingwrites to her friends.
Continuous	He is writewrotewrittenwritingwrites a book at the moment.
Perfect simple	We have already writewrotewrittenwritingwrites to the Council to complain.
Perfect continuous	She has been writewrotewrittenwritingwrites emails all morning.
Past
Simple	He writewrotewrittenwritingwrites two articles yesterday.
Continuous	He was writewrotewrittenwritingwrites all day.
Perfect simple	We had writewrotewrittenwritingwrites to them to tell them we were coming.
Perfect continuous	She was tired because she had been writewrotewrittenwritingwrites all day.
Future
Simple	I will writewrotewrittenwritingwrites to you tomorrow.
Continuous	She will be writewrotewrittenwritingwrites letters at this time tomorrow.
Perfect simple	By 5 pm he will have writewrotewrittenwritingwrites three reports.
Perfect continuous	Soon he will have been writewrotewrittenwritingwrites for ten hours.

Exercise 2 - Select what Active tense is being used in each of these sentences.

1.	He had already eaten.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
2.	She'll be having her lunch at that time.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
3.	He's talking to Peter at the moment.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
4.	Has she been to the bank yet?	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
5.	He probably won't have finished it by then.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
6.	I had been meaning to buy a new one.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
7.	She went there yesterday.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
8.	No worries, I'll do it later.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
9.	Very soon we'll have been waiting for half-an-hour.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfect future perf. cont.
10.	He goes to the gym at least twice a week.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
11.	She was wearing a light brown raincoat.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.
12.	I've been writing grammar exercises all morning.	present simplepresent continuouspresent perfectpres. perf. cont.past simplepast continuouspast perfectpast perf. cont.future simplefuture continuousfuture perfectfuture perf. cont.

The twelve tense system in table form

In many languages children learn their own native-tongue verb systems by the way of tables. This is not done much when teaching English to foreign learners, which I think is a shame, as it can help us to see the connections and relationships between different tenses.

Active tenses
Time > Aspect	Past	Present	Future
Simple	hid	hide hides	will hide
Continuous	was hiding were hiding	am hiding is hiding are hiding	will be hiding
Perfect simple	had hidden	has hidden have hidden	will have hidden
Perfect continuous	had been hiding	has been hiding have been hiding	will have been hiding

The Passive

We usually only use eight of the twelve tenses in the passive, otherwise we'd get awkward constructions like He had been being hidden or She will be being hidden.

Passive tenses
Time > Aspect	Past	Present	Future
Simple	was hidden were hidden	am hidden is hidden are hidden	will be hidden
Continuous	was being hidden were being hidden	is being hidden are being hidden are hiding
Perfect simple	had been hidden	has been hidden have been hidden	will have been hidden

Part 2 - a look at aspect

The uses of simple aspect

In some ways the simple aspect is the most difficult to describe, as it has different functions for each time and it is probably better understood by looking at the individual tenses, which I will do a bit later.

• Simple tenses are used to talk about established facts

  past	Last month Parliament passed a new law dealing with intellectual property.
  present	Companies lose millions of pounds because of this problem.
  future	The new law will come into force next week.

• present simple is also used to talk about
  • general truths, relatively permanent states and actions that happen regularly

    The sun rises in the East and sets in the West
    I live and work in Poland
    She often visits her granny in Glasgow.

• past simple is the standard tense for talking about the past

  • They arrived rather late.
    After she left university she got a part-time job in a bank.
    Many of Dicken's novels first appeared in instalment form in magazines.

• future simple is also used to talk about personal decisions made at the moment of speaking, predictions, offers, and promises.

  • That's a good idea. I'll do it right now.
    Do you think it will rain later?
    I'll help you with that, if you like.
    I won't forget to write, I promise.

More detail will be given about individual simple tenses when we look at time in Part 3

The uses of continuous aspect

We use countinuous tenses to talk about:

• actions happening around a particular time

  past	present	future
  7pm	9pm	11pm

  past	At seven we were just sitting down to supper.
  present	It's now nine o'clock and I'm doing the washing up.
  future	At eleven I'll be reading a good book in bed.

• temporary actions or situations

  past	At that time we were still living at my parents' house.
  present	She's just working there until something better turns up.
  future	We'll be travelling for about six months.

• change happening over time

  past	The company was beginning to see better times.
  present	More and more people are using social networks these days.
  future	The nights will be getting shorter soon.

See the uses of past and future tenses for specific meanings

The relationship between continuous tenses

Notice how the three continuous tenses relate to each other when talking about actions happening around a certain time.

past	present	future
3pm Friday	3pm Saturday	3pm Sunday

It is now 3pm on Saturday

Past	This time yesterday I was packing my suitcase
Present	Right now I'm sitting on a plane flying to Rio
Future	This time tomorrow I'll be lying on the beach at Coca Cobana

The uses of perfect aspect

• to describe actions completed up until a certain point

  past	present	future
  >	>	>

  past	She'd met him once or twice before.
  present	I've made two so far today.
  future	He'll have finished it by the weekend.

• with words like just, already, still and yet

  She had just moved there when it happened.
  He's already broken three world records
  Haven't you done your homework yet?
  And I bet he still won't have done it by the time we get home.

• In past and present with words like ever and never

  He had never been there before.
  Have you ever heard such an awful noise?
  

For other uses, see individual tenses

The uses of perfect continuous aspect

• to describe longer actions lasting up to a particular point in the past, present or future; actions which may or may not be completed by that point, and which may or may not continue after that point. The action is more important than its completion.

  past	present	future
  >>>>>>>>	>>>>>>>>	>>>>>>>>

  past	I'd been waiting for over an hour before he arrived.
  present	She's been chatting on the phone for at least an hour.
  future	By the time he retires, he'll have been working here for twenty years

  Example - I arrived at the bus stop at eight o'clock and it's now 8.20

  past	present	future
  08.00	08.10	08.20	08.30

  past	By ten past eight, I'd been waiting for ten minutes.
  present	It's now twenty past eight, and I've been waiting for twenty minutes.
  future	If a bus doesn't come by 8.30, I'll have been waiting for half-an-hour.

• in past and present tenses to describe the reason for an evident result

  She was out of breath because she had been running
  His hands are dirty because he has been cleaning the car

• in the future to describe the reason for an expected result

  By the time she arrives, she'll have been travelling all day so she'll be feeling tired.

Differences between perfect simple and perfect continuous

We use perfect simple when we are talking about completed actions, especially where numbers are involved, and perfect continuous when we are more interested in the activity than completed events:

• She has read all ten of his novels.
• She has been reading all morning.

With for and since we can use both perfect simple and perfect continuous, but when we want to stress how long the action lasted, we usually use perfect continuous.

• He's lived here since he was a child.
• They had been travelling since early morning.
• By the the end of this year, I'll have been working here for over twenty years.
• When I retire, I'll have worked here for over twenty five years.

The relationships between the six perfect tenses

Notice how the three perfect simple tenses and the three perfect continuous tenses relate to each other, and the difference in use between perfect simple and perfect continuous tenses.

The time is now 11.00

09.00	At nine o'clock I arrived at the office and started writing reports
	perfect simple	perfect continuous
past
10.00	An hour ago I'd finished four reports	By that time I'd been writing reports for an hour.
present
11.00	It's now 11am and I've finished eight reports	Up to now I've been writing reports for two hours
future
12.00	By midday I'll have finished twelve reports, with any luck	By then I'll have been writing reports for three hours, worst luck.

Part 3 - a look at individual tenses

Although I list the main uses of each tense, there may be some I haven't covered. In this post I don't really compare the use of one tense against another. There are one or two links below to posts that deal with that.

The uses of present tenses

• Present simple is used:
  • to talk about things that are always true or seen as permanent

    The sun warms the Earth.
    Our favourite tree stands in a large meadow.
    She sings beautifully.

  • to talk about situations that are seen as relatively permanent

    He works in the City.
    She paints in watercolours in her spare time.
    They go to the local school.

  • to talk about habits and repeated or regular actions

    He usually plays golf at the weekend
    At weekends he goes for a run.
    Each summer we go somewhere different.

  • with state verbs which aren't normally used in continuous tenses

    It's OK, I believe you.
    It belongs to my brother.
    Mmmm, that smells good!

  • when using verbs that perform the action they describe

    I promise I'll do it today.
    She apologises for what she said.
    He denies having done anything wrong.

  • to talk about series of events as we speak, for example when giving instructions and in sports commentaries

    First you take an onion, then you peel it and fry it till slighly brown.
    And Johnson gets the ball and passes to Keenan, who scores.

  • when telling stories and jokes, and talking about the plots of films, books etc

    This horse goes into a bar and asks if they serve horses.
    Two people meet in a café while waiting for their respective dates.

  • when reporting what we have seen, heard or understood

    I hear Jenny's getting promoted.
    I see you found the ice-cream, then.
    Well, that explains it!

  • to talk about the future
  • in adverbial clauses starting with if, unless, in case, as long as and certain time expressions such as when, as soon as, after, before, until

    If I see her, I'll tell her the news.
    I'll contact you as soon as I have the information.

  • with be to to say that something must happen before something else

    If we're to get there on time, we'll need to hurry
    He'll have to work harder if he's to pass his exams.

  • in that clauses about the future when the verb in the main clause also refers to the future.

    I'll make sure she gets your message.
    He's going to insist that she returns the money immediately.

  • to talk about timetabled or scheduled events in the future

    Her train arrives at 3pm tomorrow.
    The first session of the conference starts at 9am on the 21st September.
    We get off at the next stop.

• Present continuous
  • An activity in progress at the time of speaking

    Quiet! I'm trying to read this article.
    Why are we whispering?

  • A temporary situation over a longer period of time

    We're staying at my parents' until the new house is ready.
    I'm just doing this job until something better comes along.

  • Repeated actions over a limited period of time

    He's seeing a lot of Julie at the moment.
    Someone's banging on the door.

  • To talk about change, both short and long term

    It's getting a bit dark, shall I put the light on?
    The universe is still expanding.

  • Actions happening round now but not necessarily at this precise moment

    I'm reading this really good book at the moment.
    I'm considering applying for a new job

  • With certain frequency adverbs when we want to emphasise that somebody does something often, especially when we don't approve:

    He's always forgetting his keys.
    She's constantly complaining about her marriage.
    They're forever having exotic holidays. How on earth can they afford it?

  • Note - some verbs, sometimes called state or stative verbs, are not usually used in continuous tenses, eg: like, believe, know. With some state verbs, however, we sometimes use present continuous to emphasise that we are talking about a temporary situation happening now:

    She's really enjoying her new job.
    You're looking especially good today.
    The kids are loving this holiday.

  • to talk about the future
  • to talk about arrangements in the future:

    We're having a party at the weekend and you're invited.
    I'm playing golf with some friends on Saturday.
    Some of us are going for a drink after work if you want to come.

• Present perfect - to talk about events in the past that have a connection to the present:
  • at an unspecified time in the past when the time is not important

    The human race has come a long way.
    Have you met my brother?

  • events during our lifetime up until now - especially with words like ever and never

    She's never been to India before.
    Have you ever eaten octopus?

  • events during a specified period up until now - especially with for and since

    We've lived in this house for ten years.
    They haven't seen her since she left, ten years ago.

  • events in the recent past, for example in news reports

    Scientists have discovered a new species of mammal.
    The government have announced a pay freeze for public sector workers
    Great news! Timothy has passed all his exams.

  • events in the (very) recent past - especially with adverbs like just, yet, already etc

    I haven't done it yet.
    I've already told you.
    We've (just) been given a pay rise.

  • events in the past that affect the present

    They've mended the TV. (We can watch it now)
    I've ironed your shirt. (You can wear it now)
    I've read all Jane Austen's books. (I can tell you all about them)

  • repeated actions in the current time period - today, this year etc

    I've written three emails this morning.
    I' tried to call her five times since lunchtime.

• Present perfect continuous
  • for longer continuous actions, especially when we want to stress the length of time, especially with for and since.

    He's been working there for over twenty years now.
    I've been meaning to contatct you (ever) since I heard about your good news.

  • to explain a present condition

    She's been painting the sitting room and her clothes are covered in paint.
    He's exhausted. He's been digging in the garden all afternooon.
    Look! It's been raining.

The uses of past tenses

• Past simple
  • for single completed action at a specific time

    She got married last week.
    The Beatles had their first hit, with 'Love Me Do', in 1962.

  • when talking about a time that is obviously in the past

    He was a very difficult child.
    For some reason the dinosaurs became extinct.

  • when talking about relatively long-term situations

    At that time we lived in Sussex.
    When she was younger she played a lot of basketball.

  • when talking about finished time periods

    I spoke to him about it yesterday.
    We went there last year.

  • sequences of actions

    He turned off the TV, locked the back door and went to bed.
    She left the shop and crossed the road.

  • for repeated actions in the past (see note below)

    He visited his parents every weekend.
    She often popped into the library on her way home.

• Past continuous
  • actions in progress around a certain time

    What were you doing at four o'clock yesterday afternoon?This time last week I was just beginning my new job

  • temporary situations in the past

    He was staying with his parents until he could find a place of his own.
    It was raining so they decided to stay in.

  • background events in progress

    It was five o'clock and people were rushing home.
    The story starts when he was staying with his cousins in the West Country.

  • longer events in progress interrupted by a short action

    We were just sitting down to tea when the doorbell rang.
    She was travelling on the metro when she had her purse stolen.

  • longer events with verbs like wear and carry

    She was wearing an Hermès scarf and carrying a Gucci bag.

• Past perfect
  • past events which occurred before another past event

    He had already finished college before he made his first CD.
    They stayed in the very hotel where they had been on their honeymoon.
    

  • events which occurred before the main story, when the story is in the past

    She knew she had met him before, somewhere.
    She had previously worked as a waitress.

  • to say the main action happened before something else (here, unusually, it is the later action that is in the past perfect)

    It was in the days before the computer had been invented
    She left the room before I had finished saying what I had to say.

• Past perfect continuous
  • for longer continuous actions that happened up to a time in the past (and could continue), or shortly befor a time in the past.

    We had already been waiting for half an hour.
    I had been reading my newspaper and hadn't noticed the time.

  • for longer continuous actions before something happened in the past.

    They had been walking for an hour or so when they saw a small cottage.
    He was stopped by the police, even though he hadn't been speeding.

  • to emphasise that a situation before the main events lasted some time

    He had been working there all his life.
    It seemed though we had been dancing from dusk till dawn.

  • to explain a condition in the past

    She had been travelling all day so was rather tired.
    He had been running and was a bit out of breath.

Other ways of talking about the past - used to and would

As we saw, we can use Past simple to talk about repeated actions and habits and states in the past. If these are no longer true we can also use used to, and if we are talking about a repeated action, rather than a state, we can also use would

• At the time I walked to work day.
• I used to walk to work every day.
• I would walk to work every day.

For states in the past that are no longer true, we can use Past simple and used to, but not would.

• He had much longer hair then.
• He used to have much longer hair then.
• NOT He would have much longer hair then.

In this case, live and work function like state verbs

• She lived and worked in Newcastle at that time.
• She used to live and work in Newcastle.
• NOT She would live and work in Newcastle.

The structure used to is the Past simple of an old verb use to, which is no longer used. So the negative and question forms are just like any other verb in the Simple past, without the final d.

• She used to live in the South of France.
• She didn't use to visit Britain much.
• Did she use to live in the country?
• Didn't she use to write books about life in Provence?

Used to is sometimes referred to as a semi-modal (see below). There's a link below to a post with exercises on used to and would.

Narrative tenses

This is just another term for the four past tenses, which are often used in the telling of stories (or narratives), although in practice, narratives also often involve the use of other forms, such as Reported speech and Future in the past.

There is a link below to some exercises on narrative tenses about the adventures of Ruddy Wee Hoody, my version of the Little Red Riding Hood story.

The uses of future tenses

• Future simple (also known as the will future) is used to talk about:
  • simple facts (which don't involve a decision by the speaker)

    The government will make an announcement tomorrow
    This shop will be closed at the weekend for stocktaking.

  • personal decisions at the moment of speaking (often with think)

    We're running a bit late. I'll ring for a taxi.
    I think I'll help myself to another of these excellent biscuits

  • predictions

    Do you think he'll remember to buy milk?
    She says the weather will be better in September.
    I'll probably see him at the meeting.

  • offers and promises

    I'll give Sammy a hand with his homework, shall I?
    He says he'll make sure that the work is finished on time.

  • asking and agreeing to do something

    Next time you see him will you tell him I was asking for him?
    OK. I'll tell him when I see him tomorrow.

  • making orders and instructions softer, especially with have to and need to - a form of distancing

    I’m afraid you’ll need to rewrite this report. (eg your boss)
    I’ll have to ask you to come with me, Sir. (eg Customs official)
    That will be £20, please. (eg shop assistant, saying what is owed)

  Note - we also use other forms to express the simple future, which we'll look at in a moment.
• Future continuous
  • events around a certain time in the future, especially with this time or at + time reference

    This time next week we'll be lying on a beach somewhere.
    We'll still be eating at eight thirty, so why don't you call around nine?
    If all goes to plan, I'll be starting up my own company next year.

  • temporary events or situations in the future

    My brother'll be looking after the dogs while we're on holiday.
    Fiona'll be working here until Jenny comes back from maternity leave.
    After that we'll be travelling for a bit.

  • Note - for other uses of future continuous, see the next section.
• Future perfect
  • actions that will have been completed before a certain time in the future, especially with by + time reference

    We'll have finished the reports by Friday afternoon.

• Future perfect continuous - the rarest and most exotic of all tenses
  • longer events lasting until a certain time in the future

    If a bus doesn't come in the next five minutes, we'll have been waiting here for half an hour.

Other ways of talking about the simple future

The future is to a certain extent unknown, so we can't talk about it with the same certainty as we can about the present and past. Perhaps for this reason the use of tenses and verb forms is a bit different when we talk about the future.

To talk about the simple future, as well as using Future simple (or the will future), we also certain other forms:

• going to (also known as the going to future)
  • for plans and intentions - very common in spoken language

    I'm going to get my hair cut tomorrow
    Do you think she's going to apply for that new job?
    They're going to build a new playground in the park.

• Present continuous
  • for arrangements (things you've agreed with other people and can put in your diary)

    I'm having lunch with my boss tomorrow
    We're visiting my cousins at the weekend
    She's having her hair done on Friday.

  • Asking about people's plans and arrangements (more common than will or going to)

    What are you doing at the weekend?
    Do you know if Peter is coming to the pub with us later?
    Is your family planning anything special for your birthday?

• Present simple
  • for timetabled events (but we can also use will)

    The train gets in at 16.25. (or The train will get in at 16.25.)
    The meeting starts at ten sharp. (or The meeting will start at ten sharp.)

• Future continuous
  • when we want to emphasise that something has already been planned or arranged

    We will be taking a holiday in September
    I'll be seeing John at the meeting tomorrow
    During the press conference, Mary will be dealing with any questions.

  • to make future events sound planned, not decided on at the time of speaking.

    This is your captain speaking. Today we will be flying at an altitude of forty thousand feet.
    I'll be discussing this with the boss tomorrow.
    She'll be talking about increasing customer loyalty.

  • to ask polite questions about somebody's future actions - a form of distancing

    Will you be using the car later on?
    What time will you be arriving?
    Will you be staying long?

• Expressions with be (+ adjective +) to
  • the first two of these are often used in media reports

    The government are to announce new measures to combat unemployment.
    The strike is set start tomorrow, unless there is a breakthrough.
    The train is due to leave in ten minutes.
    We are just about to go out.

A comparison between will, going to, present continuous and future continuous.

will	I'll discuss it with the boss tomorrow. I'm deciding at the moment of speaking to discuss it with the boss tomorrow. The boss doesn't know anything about this.
going to	I'm going to discuss it with the boss tomorrow. I've already decided to discuss it with the boss tomorrow, but whether the boss knows this or not isn't important. The focus is on my intention, my decision.
present continuous	I'm discussing it with the boss tomorrow. I've arranged with the boss to discuss this with her tomorrow, and I'm emphasising that this arrangement has been made.
future continuous	I'll be discussing it with the boss tomorrow. I've decided to discuss it with the boss tomorrow. She probably knows about this, but here I'm simply stating a fact rather than focussing on the arrangement.

As an example of how confusing the future can be for learners, we can look at the simple event of a train leaving a station. Is this a timetabled event, a simple fact, an arrangement or a matter of some urgency? All of the following are possible:

• The next train for Bristol leaves at 16.25
• The 16.25 train for Bristol will leave from Platform 6.
• The 16.25 train for Bristol will be leaving from Platform 6 in five minutes.
• We'd better get a move on. The train's due to leave in five minutes.
• Come on! The train's leaving in five minutes.
• Hurry up! The train's going to leave any minute.