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

`@` Cấu trúc:

S + have/has + not + `V3` + for + khoảng thời gian/since + mốc thời gian.

`7.` I haven't had such a delicious meal before.

`@` Cấu trúc:

S + have/has + not + `V3` + O + before.

`8.` The last time I saw him was 8 days ago.

`@` Cấu trúc:

The last time + S + `V2` + O + was + khoảng thời gian + ago.

`9.` It is Monday since I last took a bath.

`@` Cấu trúc:

It + is + Mốc thời gian/khoảng thời gian + ago + since + S + `V2` + O...

`11.` We have learned English for five years.

`@` Cấu trúc:

S + have/has + `V3` + O... + for + khoảng thời gian/since + mốc thời gian.

`12.` I have lived in Ho Chi Minh City since I was `8.`

`@` Cấu trúc:

S + have/has + `V3` + O... + for + khoảng thời gian/since + mốc thời gian/S + `V2` + O...

`13.` She started teaching the children in this remote village five months ago.

`@` Cấu trúc:

S + started/began + V_ing + O... + khoảng thời gian + ago/when + S + `V2` + O...

`15.` She last had a swim five years ago.

`@` Cấu trúc:

S + last + `V2` + O... + khoảng thời gian + ago/when + S + `V2` + O...

`16.` They haven't talked to each other for two months.

`@` Cấu trúc: 

S + have/has + not + `V3` + O... + for + khoảng thời gian/since + mốc thời gian.

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