Since + mốc thời gian

For + khoảng thời gian

This is the first time + S + have/has + P2 (PP)

It is  the first time + S + have/has + P2 (PP)

S + have/has + never + P2 (PP) + before

S + have/has not + P2 (PP) + before

1. It has been years since we last traveled abroad.

⇒We haven’t traveled abroad for years

2. I haven’t watched TV for a week.

⇒The last time I watched TV is one week ago

3.We owned this house two years ago.

⇒We have lived in this house for 2 years

4. We have never met him before.

⇒It’s the first time we have ever met him

5. It started to rain at 2 p.m.

⇒It has rained since 2p.m

6.When did you start working here?

⇒How long have you worked here?

7.Dave has written a composition for two hours.

⇒Dave started  to write a composition 2 hours ago

8.How long have you been learning English?

⇒When did you start to learn English?

9.Keith started driving a car five years ago.

⇒Keith has driven a car for 5 years

10.This is the first time I have ever eaten this kind of food.

⇒I have never eaten this kind of food

`1.` We haven't traveled abroad for years.

`→` Phủ định của hiện tại hoàn thành : S + have/has not + VPII + for/since thời gian

`2.` The last time I watched TV was a week ago.

`→` The last time (Lần cuối cùng)+ S + V quá khứ + was + thời gian

`3.` We have bought this house for two years.

`→` S + have/has + VPII + for/since + thời gian

`4.` It's the first time we have met him.

`→` Lần đầu tiên làm một việc nào đó : It/This is the first time + S + have/has VPII

`5.` It has rained since 2 p.m

`→` S + have/has + VPII + for/since + thời gian

`6.` How long have you worked here ?

`→` Câu hỏi hiện tại hoàn thành với How long :

How long + have/has + S + VPII ?

`7.` Dave started writting a composition two hours ago.

`→` S + have/has + VPII + for/since + thời gian= S + started/began + VING/TO V + thời gian 

`8.` When did you start learning English ?

`→` How long + have/has + S + VPII ? = When did + S + start Ving/TO V ?

`9.` Keith has driven a car for five years.

`→` S + started/began + VING/TO V + thời gian = S + have/has + VPII + for/since + thời gian

`10.` I have never eaten this kind of food before.

`→` It/This is the first time + S + have/has VPII = S + have/has never + VPII + before