1) You have been behaving like this ever since I first came here.
2) When were you in London?
3) The thing is that I have come to have a talk.
4) Have you been waiting long? Did you wait long?
5) Most of the children here have already had measles .
6) She finished cleaning the bathroom, then she began peeling potatoes.
7) She has never had the slightest desire to be an actress.
8) He has been looking forward to it all the week.
9) They left just a week ago.
10) I have been thinking about nothing else since then.