1.I have not worked today.
2.We have bought a new lamp.
3.We haven't planed our holiday yet.
4.Where have you been ?
5.He has written five letters.
6.She hasn't seen him for a long time.
7. have you been at school?
8.School hasn't started yet.
9.has he spoken to his boss?
10.No, he hasn't had the time yet.