1 have you ever seen..
2 when did you last ..
3 he has gone..
4 i haven't seen Bob since..
5 lessons start at..
6 look at the children. They are swimming. .
7 John has phoned yet..
8 i can't walk. I have sprained. .
9 sorry! I haven't cooked dinner yet
10 we haven't been to the village when we were children