It's great to see you! But what *you are doing / are you doing* here in London?
are you doing
Dan really likes that restaurant, but I *think not / don't think* the food's very good
don't think
Excuse me, *can I / I can* sit here?
can I
Don't worry about Anna. *She's always / She always is* late.
she's always
Ask Jamie to help you. He *works / work* in IT, so he's really good with computers.
works
