1. She has worked for this company for six months.

2. We have lived in Hue for ten weeks.

3. Mr.Nam has checked that machine since 3 o'clock.

4. He's fixed the red car since Monday.

5. They've not worked since it rained.

6. She's not learnt English for two years.

7. He has not been in Ha Noi capital for ten days.

8. He has not smoked for two months.

S + started/began + V_ing + thời gian + ago/last + thời gian/in + thời gian.

→S + have/has + V3 + for + thời gian/since + thời gian.

It's + thời gian + ago/last + thời gian + since + S + V(quá khứ).

→S + have/has + not + V3 + for + thời gian/since + thời gian.

S + stopped + V_ing + thời gian + ago/last + thời gian.

→S + have/has + not + V3 + for + thời gian/since + thời gian.