1.She eats more chocolate than I.
 I don't eat as much as chocolate than she does
2.Vinh keeps forgetting his homework
Vinh is always forgetting his homework
3.Keeping the enviroment clean is very important.
It's very important to keep the environment clean
4.No one helped Lan to do the homework.
Lan did the homework by herself
5.It's three years since I last spoke to her.
I haven't spoken to her for three years
6.Tam doesn't type as fast as she used to.
Tam used to type fast
7.How long is it since you used the car?
When did you use the car?
8.We started living here 15 years ago.
We have lived here for 15 years
9.Let's meet inside the center,at the cafe corner?
How about meeting inside the center at the cafe corner
10.Nam is very strong,he can do heavy work.
Nam is strong enough to do heavy work