should + V1 : nên làm gì 

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Công thức - bị động:

- Thì HTĐ: S + am/is/are + V3/ed 

- Thì QKĐ: S + was/were + V3/ed 

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1. We should use reusable bags instead of plastic bags.

2. The rubbish in our school is collected by the Clean-up twice a week,

3. His cover song videos were uploaded on the social media by his mother. 

1. We should use public transports instead of private vehicles.

2. All the classrooms are cleaned up by the club’s members twice a month.

3. Photos of the events were posted on the club’s website by Nam.

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