1) Mr Smith used to live on a farm in the countryside 

2)The teacher asked her student not to forget to say thank you to our moms

3)My mother said to me not to stay up  surfing the Internet too late

4)My school isn't as/so big as Tuan's school

5)Mr Lan has been working in that hospital for 2 months

6)Nam is such an intelligent people/student that he can pass the exam

3.Mr.Smith used to liven on a farm in the countryside.

4.The teacher asked her students not to forget to say thank you to their mom.

5.My mother said to me that I should not stay up surfing the internet too late.

6. My school isn't as big as Tuan's one.

7.Mr.Lam has worked in that hospital for two months.

8.Nam is intelligent enough to pass the exam.