`1` He has studied English for six years .

`2` She has learnt to drive for `1` month .

`3` I have taught in this school for seven years .

`4` They have played football for `30` minutes .

`5` Lan has written a letter for an hour .

`-` Chuyển đổi thì quá khứ đơn `-` hiện tại hoàn thành .

`@` S + started/began + V-ing + O + time : Ai đó bắt đầu làm gì từ khi nào .

`->` S + have/has + V3/Vpp + O + time : Ai đó đã làm gì được bao lâu .

`color{red}{#Atr}`

`1.` He has studied English for six years.

`2.` She has learnt to drive for `1` month.

`3.` I have taught in this school for seven years.

`4.` They have played football for `30` minutes.

`5.` Lan has written a letter for an hour.

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`@` Chuyển câu với thì

`->` S + started/began + to V-bare/V-ing + times ago/in time

`=` S + have/has + Vp2 + for times/since time