1.Why not..2.Why don't..3.Why did..4.do sb.a favor5.pretend6

1.Why not go to a movie
2.Why don't you give her a camera?
3.Why did she go to school at night?
4.Can you do me a favour?
5.He pretends as though he were not guilty.
6.You had better finish your homework first.
7.I want to go there the sooner the better.