When to use do after who in questions (and when not to).

Recently I read on a language website about how a student was confused about when to use do after who in questions, as someone had told him we can't use do/does/did after who. I don't know who that 'someone' was, but they had obviously got a bit confused themselves. Yes, there are times when we don't use do/does/did after who (and some other question words), but it is really the exception rather than the rule.

Read about using auxiliary do/does/did in questions, and do a couple of exercises.

Tag questions and short answers - exercises

Sometimes they're called question tags, sometimes tag questions. It's all the same. I'm sure you know the basic principles, so use your instinct to complete the exercises. The first exercise looks at some standard tags, the others at some more advanced points. There's also a video exercise at the end.

If you have any problems you can consult one of the websites linked to at the bottom. The BBC one is probably the clearest. But try the exercises first. And don't forget the video exercise; it's from a TV comedy series.