`-` Áp dụng: 

`+)` S + have/has + VII + since + mốc thời gian

`+)` S + have/has + not + VII + since + mốc thời gian

`+)` S + have/has + VII + for + khoảng thời gian

`+)` S + have/has + not + VII + for + khoảng thời gian

______________________________

`1.` she hasn't kissed me for 5 months

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

`3.` we haven't met for a long time

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

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

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

* Cấu trúc:

- The last time + S + V2/ed + was + thời gian + ago

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

- S1 + last + V2/ed + when + S2 + V2/ed 

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

- It + is + thời gian + since + S + (last) + V2/ed

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