37. A lot of buildings are built by the workers.

-Bị động thì HTĐ

38. This house was being built at this time last year.

-Bị động thì QHTD

39. Trees were being planted in the garden at 4 pm yesterday. 

-Bị động thì QHTD

40. The chalk board is always erased after class by one of the students.

-Bị động thì HTĐ

37. The workers build a lot of buildings.

-> A lot of buildings are built by the workers

Bị động ở thì HTĐ: S + tobe + V3/ed +(by O)

38. They were building this house at this time last year.

-> This house was being built at this time last year

Bị động ở thì QKTD: S + was/were +being +v3/ed (by  O)

39. He was planting trees in the garden at 4 pm yesterday.

-> Trees were being planted in the garden at 4 pm yesterday. 

Bị động ở thì QKTD

40. One of the students always erases the chalk board after class.

-> The chalk board is always erased by one of the students after class

Bị động ở thì HTĐ

#HN

#Chuc_ban_hoc_tot