4. The trees and flower are taken care of by the gardeners of the Temple of Literature.

5. All the tickets for the trip to the Temple of Literature are sold.

6. Ha Long Bay was regarded as a World Heritago Site by UNESCO in 1994.

7. Oxford University is regarded as one of the best universities in the UK.

8. The imperial Acedemy was regarded as the first university in Viet Nam.

9. The Doctors' stone tablets were ercected by King Le Thanh Tong.

Cấu trúc:

I. Past simple passive: (thì quá khứ đơn bị động)

(+) S + be(was/were) + past participle 

(-) S + be(was/were) + S + past participle 

(?) Be + (was/were) +  S + past participle