Explications:
present Perfect: Has/have + participe passé
1) I have gone to the library today.
2) you have kept a pet for three years.
3) have you eaten Thai food before.
4) has it rained all day?
5) who have we forgotten to invite?
6) we have not heard that song already.
7) he has not forgotten his books.
8) she has stolen all the chocolate!
9) have I explained it Well?
10) who has he met recently?
