1.It is about 2 kilometers from my house to my school

-> It + tobe about ... kilometers from ... to.....

2.Must we always obey the traffic rules.?

-> Model verb + S + V .... ?

3.Where did you stay when you were in Hanoi?

-> Where aux + S + V ?

4.I used to ride a tricycle when I was 3 years old.

-> used to v : đã từng

5.How about going cycling ...... ?

-> How about Ving = why don't we + V

6.What did you use to do on ..... ?

-> used to v : đã từng

7.There used to be some big trees in the field.

-> used to v : đã từng

8.In the past my hair used to be much shorter than now.

-> used to v : đã từng

33 It is about two kilometers from my house to my school.

34Must we always obey the traffic rules?

35Where did you stay when you were in Hanoi?

36I used to ride a tricycle when I was three years old.

37How about going to cycle round the Lake on Saturday?

38What did you used to do on Saturday evenings?

39There used to some big trees in the field before now

40In the past my hair used to shorter than this at now