1. They have moved to Ho Chi Minh City since 1990.

- Kiến thức: Chuyển từ thì quá khứ đơn -> Hiện tại hoàn thành

- S + Ved/ V2 + ... + in + time

= S + have/has + Vpp + ... + since + time.

2. Sue has worked with me for three months.

- S + Ved/ V2 + ... + time + ago.

= S + have/has + Vpp + ... + for + time.

3. I have leart English for seven years.

- S + started/ began + V-ing/ to V + O + time + ago.

= S + have/has + Vpp + O + for + time.

4. He hasn't met John since last summer.

- S + last + Ved/ V2 + O + time

= S + have/ has + not + Vpp + O + for/ since + time.

`1` They have move to Ho Chi Minh City since 1990 

`=>` S + Ved/V2 + O

`=>` S + has/have + Ved/V3 + O 

`=>` in + time `->` since + mốc thời gian 

`2` Sue has worked with me for three months 

`=>` S + Ved/V2 + O 

`=>` S + has/have + Ved/V3 + O 

`=>` time + ago `->` for + khoảng thời gian

`3` I have learned/learnt English for seven years 

`=>` S + started/began + to V/V-ing + time

`=>` S + has/have + Ved/V3 + for/since + time

`4` He hasn't met John since last summer

`=>` S + last + Ved/V2 + O + time

`=>` S + hasn't/haven't + Ved/V3 + for/since + time