1. - I haven't visited Hanoi for two years.

⇒ Từ QKĐ chuyển sang HTHT : have/has V3/ed, for + khoảng time

- It's two years since I last visited Hanoi.

⇒ It's + time + since QKĐ

- I haven't been to Hanoi for two years.

⇒ S + have/ has + not + Verb(PII)+…+ for + khoảng thời gian

2. Minh hasn't been stopped using this computer for Sunday

⇒ S + have/ has + not + Verb(PII)+…+ for + khoảng thời gian

3.

- I haven't visited Hanoi for two years

- It's two years since I last visited Hanoi

- I haven't been to Hanoi for two years

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S have/has not VPII for..

It's ... since QKĐ

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4. Minh hasn't been using this computer since Sunday

- thì HTHTTD: S have/has not been Ving since