Đáp án:

Giải thích các bước giải:

1. We have learned English for 10 years

⇒ We started learning English 10 years ago. 

2. It has been a long time since we last met

⇒ The last time we met was a long time ago.

3. Ms. Ann hasn’t taken part in any voluntary programs for 4 years.

⇒ The last time Mr.s Ann took part in many voluntary programs was 4 years ago.

4. I haven’t mer my family since last Christmas.

⇒ The last time I met my family was last Christmas.

5. How long have you lived here?

⇒ When did you start living here ?

6. The volunteers have provided free food and fresh water to homeless people since yesterday.

⇒ The volunteers provided free food and fresh water to homeless people yesterday. 

7. The doctor has quitted his job in the local hospital and moved to the central hospital for 2 days.

⇒ The doctor quitted his job in the local hospital and moved to the central hospital 2 days ago. 

8. The children haven’t had a long vacation since last year.

⇒ The last time the children had a long vacation was last year. 

9. They haven’t visited their parents for 3 months.

⇒ The last time they visited their parents was 3 months ago.

10. It has been 2 years since we broke up

⇒ We broke up 2 years ago. 

Giải thích:

-S + started/began + doing sth + time + ago

=S + have/has + VpII + for + time

-When did + S + V?

=  How long + have/has + S + VpII?

-This is the first time + S + have/has + VpII

= S + have/has  + never + VpII + before.