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6. The Greens (be) have been to many countries in the world so far.

7. We (go) have gone to that village to do volunteer work several times.

8. Our teacher (explain) has explained to us how to use the printer already.

9. My pen isn’t here any more. Someone (take)has taken it already.

10. Mai (not finish) hasn't finished her homework yet.
11. They (not see) haven't seen the film Titanic yet.

12. I (not see) haven't seen your brother yet.

III. Chia động từ ở 2 thì: Quá khứ đơn và Hiện tại hoàn thành (chú ý vào dấu hiệu).

1. Tom (call) called his boss yesterday.

2. I (meet)met Robert at the supermarket this morning.

3. We (fly)have flown to Ha Noi several times, but last summer we (go)went there by train.

4. When (your father/ give up) did - give up smoking?

5. My uncle (move)moved to Da Lat in 2005.

6. I (be)have been to Sa Pa twice since 2000.

7. We (spend) spent our summer vacation in Ha Long Bay last July.

8. I (watch) have watched the film Titanic already.

9. The postman (deliver)delivered the letter half an hour ago.

10. I (hear)heard the good news from Mary a few minutes ago.

Tloo Kickkat