`color{aqua}{\text{_ThuyLinh}}`

`1,` He hasn't gone abroad.

- This is the first time + S + has/have + Vpp + O 

= S + has/have + not/never + Vpp + O + before

`2,` She has driven for 1 month.

- S + started/began + to V/V-ing + O + when/in/on/at...

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

`3,` We have eaten when it started to rain.

- S + started/began + to V/V-ing + O + when/in/on/at...

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

`4,` I haven't had my hair cut since I left her.

- S + last + Ved/V2 + O + thời gian  

= S + has/have + not + Vpp + O + for/since + thời gian

- for + khoảng thời gian , since + mốc thời gian 

`5,` She hasn't kissed me for 5 months.

- The last time + S + Ved/V2 + O + was + thời gian 

= S + has/have + not + Vpp + O + for/since + thời gian 

- for + khoảng thời gian , since + mốc thời gian 

`6,` We haven't met each other for a long time.

- It's + thời gian + since + S + (last) + Ved/V2 + O

= S + has/have + not + Vpp + for + thời gian