+) S + started/began + Ving in năm/ khoảng tgian + ago

=> The last time S + (last) + quá khứ đơn was + khoảng thời gian ago/ in năm/tháng

=> S + hiện tại hoàn thành + since + năm

=> It's + khoảng tgian since + S last + quá khứ đơn

+)  hiện tại hoàn thành + since + quá khứ đơn

1. Samuel has kept a diary since 1997.

2. We have learnt English for fìve years.

3. I have lived in Ho Chi Minh City since I was 8.

4. She started/ began teaching the children in this remote village five months ago.

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

6. She last swam was five years ago.

7. They have not 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 were married.

11. They haven’t cleaned their room for two weeks.

`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.