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 8 months ago.

6. ⇒She last hadn't had a swim 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 didn't write to me.
10.⇒ It’s ten years since Robert and Catherine had married.
11.⇒ they have deaned their room for two weeks.
12. ⇒John has had his hair cut for over six months.