5.5. Didn't they start the Green Project in 2020?2020?

→→ in ++ mốc thời gian

6.6. Our class gave away warm clothes to street children two days ago.

→→ give away sth: cho miễn phí cái gì

7.7. Mr. Ninh started cycling rubbish two years ago.

→→ start doing sth: bắt đầu làm gì

8.8. I joined in my school volunteer team last summer.

→→ join in sth: tham gia vào cái gì
 

99 We couldn't keep on cleaning this street because of the heavy rain .

−- S + keep on doing sth : Ai đó kiên trì làm gì ....

−-S + V + O + because of + V_ing/N + O ... : Ai dó làm gì bởi vì điều gì ...

1010 Jim did the homework and he listened to the music .

−- S + V + O + and + S + V + O ... : Ai đó làm gì và ai đó làm gì ...

∘∘ Công thức thì quá khứ đơn :

(( ++ )) S + V(quá khứ) + O ...

(( −- )) S + didn't + V-inf + O ...

(( ?? )) Did + S + V-inf + O ... ?

1. We prepared the table a few minutes ago.
2. What did your mother do at weekends?
3. Last week, the doctor advised me not to swim for a few weeks.
4. Did you provide evening classes for sixty children last summer?
5. They did not start the Green project in 2020.
6. Our class gave away warm clothes to street children two days ago.
7. Mr. Ninh started recycling rubbish two years ago.
8. I joined my school volunteer team last summer.
9. We couldn't keep on cleaning the street because of the heavy rain.
10. Jim did his homework and he listened to music.