1. They have studied English when they were in grade 3.

2. He has chatted on the phone when it begin to rain.

3. She has done the housework when she get home

4. She has taught for 20 years.

5. We have talked for two hour.

6. My father has worked as an engineer when he was 23 

7. She has worked as a teacher for 6 months.

8. Samuel has kept a diary since 1997.

9. We have learned English for five years.

10. I have lived in Ho Chi Minh City when I was 8.

11. She has driven for 1 months.

12. We have ate when it started to rain.

13. It has rained since 2 o'clock.

14. She has learned English for 8 years.