`4)` I began to do the shopping 3 hours ago.

`=>` I have done the shopping for 3 hours.

`5)` My teacher began to teach E when she was 20.

`=>` My teacher has taught E since she was 20.

`6)` My father has smoked for ten years

`=>` My father began smoking ten years ago.

`@` Kiến thức : 

`-` S + began / started + to V/ V-ing + time ago : bắt đầu làm gì

`=>` S + have/has + P2 / been Ving+ for / since ...

`4.` I have done the shopping for `3` hours.

`5.` My teacher has taught English since she was `20.`

`6.` My father began smoking ten years ago.

`-` Cấu trúc: S + started/ began + V_ing/ to -V + time ( t/g trong quá khứ ) (+ago)

   `->` S + have/has + Vpp + since/ for + time