I
33 It is about 2 kilometers from my house to my school.
34 Must we always obey the traffic rules?
35 Where did you stay when you were in Hue?
36 I used to ride a bicycle when I was three years old
II
37 How about going cycling round the Lake on Saturday ?
-> How about + Ving = Why don't we + Vinf.
38 What did you use to do on Saturday evenings? ( Did + S + use to Vinf )
39 There used to be some big trees in the field. ( used to + Vinf )
40 In the past my hair used to be shorter than now.