Giúp em với ạ đang cần gấp

Công thức bị động - các thì 

Thì QKĐ: S + was/were + V3/ed 

Thì QKHT: S + had been + V3/ed 

Thì TLĐ: S + will be + V3/ed

Thì TLG: S + am/is/are + going to be + V3/ed

------------------------------

8. This house was built by my grandfather in 1990.

9. Three books had been written before 1867.

10. A luxury car will be bought by Hanh.

11. The classroom is going to be decorated by Johnny and Ted this Christmas.

#STMIN