1 Vinh is always forgetting his homework
2 Do you mind helpong me put the chair away?
3 I'd rather you did't make any noise because I'm very tired
4 I have never used such a good computer
5 It's ages since he last chatted with his classmates through the Internet
6 The last time we saw her was when we left the university
8 It's very important to keep the environment clean
9 Minh has collected stamps since 2000
1. Vinh is always forgetting his homework
2, do you mind helping me put the chairs a way?
3. I'd rather you didn't make any noise because I'm tired
