`1`. The students did homework at five o'clock yesterday afternoon

`2`. People have used ballpoint pens for many years

`3`. Sometimes people have communication problems because of the language barrier.

`4`. Mr.Tan was disappointed that his son had failed the university entrance exam.

`5`. Would you mind if i used your bicycle for a minute?

$Rose Renaissance$

1. The students were doing homework at five yesterday afternoon

2, People have used ballpoint pens for many years

3. Sometimes, people have communication problems because of the language barrier.

4. Mr.Tan was disappointed that his son had failed the university entrance exam.

5, Would you mind if i used your bicycle for a minute?

 - Would/Do you mind if S + V(quá khứ đơn)?

Học tốt!!!