Bị động - các thì:

- Thì HTHT: S + has/have + been + V3/ed 

- Thì QKĐ: S + was/were + V3/ed 

- S + must be + V3/ed 

- Thì QKHT: S + had +been + V3/ed 

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19. Great progress has been made in industry, science, and medicine.

20. A lion was killed by Sam last week.

21. Your report must be handed in before the end of this month.

22. The job has just been finished when the factory closed.

`color{orange}{~MiaMB~}`