`16,` He hasn't gone abroad for `6` years.

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

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

`19,` We haven't met each other for `5` months.

`20,` I haven't had such  a delicious meal since `2018`.

`21,` I haven't seen him since `2015`.

`22,` She  hasn't visited her home country for ten  years.

`23,` He hasn't had his eyes  tested for ten months.

`24,` I haven't  seen Rose for three years.

`25,` I haven't written to her for  five years.

`--`

Giải thích:

`-` The last time `+` S `+` V-ed/V2 `+` was `+` khoảng thời gian `+` ago.

`-` S `+` last `+` V2/V-ed `+` khoảng thời gian `+` ago.

`=` S `+` have/has `+` not `+`  V-ed/V3 `+` for `+` khoảng thời gian/since + mốc tgian..

`-------` 

`26,` He said that he liked that song.

`-` like `->` liked (HTĐ `->` QKĐ) 

`-` I `->` he 

`-` this `->` that 

`27,` She said that she didn't speak Italian.

`-` don't `->` didn't (HTĐ `->` QKĐ) 

`-` I `->` she 

`28,` He said that the film began at seven o'clock.

`-` begins `->` began (HTĐ `->` QKĐ) 

`29,` She said that she was very tired.

`-` I `->` she 

`--` 

Giải thích:

Câu gián tiếp dạng trần thuật:

`-` S `+` told/asked/said `+` that `+` S `+` V(lùi thì)…