1. saw ; I was waiting 

2. has been (hiện tại hoàn thành)

3. has taught (hiện tại hoàn thành) ; graduated (quá khứ đơn)

4. doesn't watch (hiện tại đơn)

5. met (quá khứ đơn)

6. reported (quá khứ đơn)

7. had thanked (quá khứ hoàn thành)

8. stealed (quá khứ đơn)

9. have lived (hiện tại hoàn thành) ; broke (quá khứ đơn)

10. had been (quá khứ hoàn thành)

11. I am usually (hiện tại đơn)

12. was (quá khứ đơn) ; had been (quá khứ hoàn thành)

1. I was see a car accident while i was waiting for you on this corner yesterday.

2. Mr Jone has been principal of our school since last year.

3. Mr Smith has taught at this school since he graduated in 1980.

4. My father doesn't watch TV every night.

5. I met Arthur three weeks ago.

6. Yesterday, the police reported that they captured the thief.

7. My friend had thanked me for what i had done for him.

8. Someone stealed my handbag on the bus.

9. The Browns have lived in Paris for 7 years when the seconf World Wat broke out.

10. Last month i had been in the hospital for ten days.

11. Don't call me in the afternoon. I am usually away in the afternoon.

12. Mr Clack was in New York 2 months ago. Mr Rossi had been in New York until 2 months ago.

              CHÚC BẠN HỌC TỐT~~