Giúp mình giải bài này với ạ cảm ơn nhiều

$Đáp$ $án$ + $giải$ $thích$:

`1`. `S`he hasn't come back to her hometown for `4` years.

`2`. `H`e has worked as a ank clerk for `3` months.

`3`. `W`e haven't flown to Singapore for `5` years.

`4`. `I` haven't had my hair cut since November.

`5`. `W`e haven't called each other for `5` months.

`6`. `W`e haven't met for a long time.

`--------------------`

`@` `C`ấu trúc QKĐ <=> HTHT

`-` `S` + started/began + toV/Ving + ago/in, when

`-` `S` + have/has + V3/ed + for.../since...

`-` `T`he last time + S + V2/ed + ... + was + in..../...ago

`-` `I`t's + năm/khoảng thời gian + since + S + V2/ed

`-` `S` + haven't/hasn't + V3/ed + for.../since...