Đề bài : present perfect rewriting 

`1)` He hasn't met his mother for a long time.

`2)` It is more than 2 years since I last went to Da Nang.

`3)` It is a month since he last had his hair cut.

`4)` It is 2 years since I last went to the library.

`5)` It is 4 months since they last cut the grass in this garden.

`6)` They haven't drunk coffee together for over a year.

`7)` I haven't danced with him for more than ten years.

`8)` It is 3 months since they last lived this house.

`9)` He hasn't played computer games for two weeks.

`10)` It is a month since she last met her classmates.

`-` It is + khoảng thời gian + since + S + (last) + Ved/V2 

`=` S + has/have + not + Ved/V3 + ... + for + khoảng thời gian 

`1.` He hasn't met his mother for a long time.

`2.` It is more than 2 years since I last went to Da Nang.

`3.` It is a month since he last had his hair cut.

`4.` It is 2 years since I last went to the library.

`5.` It is 4 months since they last cut the grass in this garden.

`6.` They haven't drunk coffee together for over a year.

`7.` I haven't danced with him for more than ten years.

`8.` It is 3 months since they last lived this house.

`9.` He hasn't played computer games for two weeks.

`10.` It is a month since she last met her classmates.

`=>` It is + khoảng thời gian + since + S + last + V2/ed

`<=>` S + haven't/hasn't + V3/ed + for + khoảng thời gian