1. We had to work overtime yesterday bacause we still had a lot of time for our prject.
2. We needn't have brought food because we didn't know that there were lots of foodstalls there.
3. You have don't to do it now.
5. How long is it since you saw "Gone with the wind"?
6. When did you work as a teacher?
7. Nam has not gone to the cinema for 2 years.
9. It is time for you to speak to your parents when you have problems.