`1` He has had a cold for a week .

`2` They have bought the new house since September .

`3` My family has been here since Christmas .

`4` We have not seen each other for `10` years .

`5` Mr.Nam has worked in the bank for a long time .

`6` Tom and Jerry have loved each other for a long time .

`7` My sister has started a new job since yesterday .

`8` Mr.Robinson has taught in this school since `1997` .

`9` I have written this letter since six o'clock .

`10` W have left our hometown since I was a child .

`-` Hành động đã xảy ra trong quá khứ nhưng còn liên quan đến hiện tại .

`=>` Hiện tại hoàn thành .

`( + )` S + have/has + V3/Vpp + O .

`( - )` S + have/has + not + V3/Vpp + O .

`( ? )` Have/has + S+ V3/Vpp + O `?`