A. Simple past  Present perfect: 1. My father gave up smoking 10 years ago. My father............................................................................................................................. 2. Ruby last met her close friend 5 weeks ago. Ruby hasn’t.......................................................................................................................... 3. We began playing the piano two years ago. We have............................................................................................................................... 4. The last time we saw him was two weeks ago. We haven’t.......................................................................................................................... 5. I began to teach these students three years ago. I have ..................................................................................................................................

Công thức:
have/has+V3/ed
last+V2/ed<=>have/has+not+V3/ed
Began+V_ing<=>have/has+V3/ed
Began+to V<=>have/has+V3/ed
1. My father gave up smoking 10 years ago.
My father has given up smoking for 10 years.
2. Ruby last met her close friend 5 weeks ago.
Ruby hasn’t met her close friend for 5 weeks.
3. We began playing the piano two years ago.
We have played the piano for two years.
4. The last time we saw him was two weeks ago.
We haven’t seen him for two weeks.
5. I began to teach these students three years ago.
I have taught these students for three years.

`A.`Simple past and Present perfect:

`1.`My father hasn't been smoking for 10 years.

`-`Trong câu xuất hiện "gave up smoking" : bỏ hút thuốc `=>`Hiện tại không còn hút nữa

`=>`Phủ định của hiện tại hoàn thành : S + have/has not + Vpp + since/for + time

`2.`Ruby hasn't met her close friend for 5 weeks.

`=>`S + last + V2/ed + time ( thời gian trong quá khứ )

`=`Phủ định của hiện tại hoàn thành : S + have/has not + Vpp + since/for + time

`3.`We have played the piano for two years.

`=>`S + began/started + Ving/to V + time

`=`S + have/has + Vpp + since/for + time

`4.`We haven't seen him for two weeks.

`=>`The last time + S + V2/ed + was + time

`=`Phủ định của hiện tại hoàn thành : S + have/has not + Vpp + since/for + time

`5.`I have taught these students for three years.

`=>`S + began/started + Ving/to V + time

`=`S + have/has + Vpp + since/for + time