2. They started studying English when they were in grade 3. They have 3. This is the first time I have been abroad. I havent 4. I havent met my aunt since I was 10 years old. I last 5. It is a long time since she last saw her parents. She hasnt 6. This is the first time I have seen this movie. I havent 7. I last saw him 3 weeks ago. I havent 8. The children havent been taken to the park since 2012. The last time 9. He last sent me postcards when he was in Paris. The last time. 10. When did you start to wait for the bus? How long have .?

2. They started studying English when they were in grade 3 .

<-> They have studied English since they were in grade 3 .

3.This is the first time I have been abroad .

<-> I haven't been abroad before .

4. I haven't met my aunt since I was 10 years old 

<-> The last time I met my aunt was when I was 10 years old .

5. It is a long time since she last saw her parents.

<-> She hasn't seen her parents for a long time. 

6. This is the first time I have seen this movie .

<-> I haven't seen this movie before .

7. I last saw him 3 weeks ago .

<-> I haven't seen him for 3 weeks .

8. The children haven't been taken to park since 2012 .

<-> The children last took to park in 2012 .

9. He last sent me postcards when he was in Paris .

<-> He hasn't sent me postcards since he was in Paris .

10. When did you start to wait for the bus ?

<-> How long have you waited for the bus ?

Cách biến đổi thì thì Quá khứ đơn sang Hiện tại hoàn thành và ngược lại 

* S+(last)+V(chia thì quá khứ đơn dạng khẳng định)+...........+when.....TG/ago

<-> S+V(chia thì hiện tại hoàn thành dạng phủ định )+.........+since........./for....TG...(bỏ last)

* The last time+S+V (chia ở thì quá khứ đơn dạng khẳng định)+....+was in(at)..../was......ago

<->                   S+V(chia ở thì hiện tại hoàn thành dạng phủ định)....+ since/for

* S+V(chia ở thì quá khứ đơn-start/begin)+.......+ago

<-> S+V(chia ở thì hiện tại hoàn thành)+............+since/for(bỏ start/begin)

*                                           S+V(chia ở thì hiện tại hoàn thành dạng phủ định/never)+.......+before

<-> It/This is the first time+S+V(chia ở thì hiện tại hoàn thành dạng khẳng định)+.......(bỏ before)

*                                 S+V(chia ở thì hiện tại hoàn thành dạng phủ định/never)+for+time

<-> It's+time+since+S(last)+V(chia ở thì quá khứ đơn dạng khẳng định)+.......(bỏ for)

---Chúcbạnhọc tốt---

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