refer
1, Samuel has kept a diary since 1997.
2, We have learned English for fìve years.
3, I have lived in Ho Chi Minh City since I was 8.
4, She started teaching the children in this remote village five months ago.
5, The last time he wrote to me was in April.
6, She last swam five years ago.
7, They haven't talked to each other for two months.
8, She hasn’t seen her elder sister since 1999.
9, It’s years since she last wrote to me.
10, It’s ten years since Robert and Catherine got married.
11, They haven’t cleaned their room for two weeks.
12, John last had his hair cut six months ago.
13, When did you start riding a bike?
14, When did he last write to you?
15, How long is it since he last talked to you?
16, Hong long is it since you last telephoned him?
17, It’s the first time I have eaten this kind of food.
18, I have never seen this film before.
