11)Samuel has been keeping a diary since in 1997.

12)We have been learning English for five years.

13)I have been living in Ho Chi Minh City since I was 8.

14)She started to teach the children in this remote village 5 years ago

15)The last time he wrote to me was in April.

16)She last had a swim five years ago.

17)They haven't talked to each other for two months.

18)She hasn't seen her elder sister since 1999

19)It's years since she last wrote to me.

20)It's ten years since Robert and Catherine were married

`11.` Samuel has kept this diary since 1997.

`12.` We have learnt English for five years.

`13.` I have lived in Ho Chi Minh city since I was 8.

`14.` She started to teach the children in this remote village five months ago.

`15.` The last time he wrote to me was in April.

`16.` She last had a swim five years ago.
`17.` They haven't talked to each other for two months.

`18.` She hasn't seen her elder sister since 1999

`19.` It's years since she last wrote to me.

`20.` It's ten years since Robert and Catherine were married.