15.
1)I haven't finished my homework yet
2)the rain stopped but ...
3)we went to bed very early last night because we were tired
4)they moved to London 2 years ago
5) she hasn't visited me since Tuesday
6)I've just seen a very interesting programme on TV
7)Laura has never been to London
8)what books did you read when you lived in the country?
9)I haven't been to a disco for months
10)My little sister hasn't learned to read yet
11)he has never been to Germany
12)Do you booked the tickets? Yes, I booked them several days ago
13)my mother went to the country a month ago
14)his brother didn't go to school yesterday
15)where have you been last night?