1.

$→$ It is two weeks since i last saw him.

$→$ I haven't seen him for two weeks.

2. 

$→$ The last time I visited Ha Long Bay was two years ago.

$→$ I haven't visited Ha Long Bay for two years.

4. 

$→$ It is ten years since I last played football.

$→$ The last time I played football was ten years ago.

5. 

$→$ The last time she had a swim was over six months ago.

$→$ She hasn't had a swim for over six months.

6.

$→$ The last time I went to HCM City was two years ago.

7.

$→$ It's the first time she has seen that boy here.

GT:

$⇒$ Cấu trúc: 

$+)$ It is/was + khoảng thời gian + since + S + last + V2/ed.

$+)$ S + haven't/hasn't + V3/ed + for + khoảng thời gian

$+)$ The last time + S + V2/ed + was + thời gian

$+)$ It's the first time + S + have/has + V3/ed

$⇒$ Lưu ý:

$+)$ for + khoảng thời gian

$+)$ since + mốc thời gian (qk)

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