=>
I/
1. A song was sung (by her).
2. I was called.
3. The bus was stopped (by us).
4. My house was built by an architect.
5. A book wasn't bought.
6. That pizza wasn't eaten (by her).
7. The dog wasn't fed.
8. They weren't told (by me).
9. Were they told (by you)?
10. Was the car washed (by him)?
Bị động QKĐ :
(+) S was/were V3/ed (by O)
(-) S was/were not V3/ed (by O)
(?) Was/were S V3/ed (by O)?
II/
1. The computers are fixed.
2. The clothes are washed.
3. The shoes are cleaned.
4. The house is painted.
5. The garbage is thrown.
6. The e-mail is sent.
7. The story is not read.
8. The homework is not done.
9. The dessert is not eaten.
10. The restaurant is not closed.
Bị động HTĐ :
(+) S is/am/are V3/ed (by O)
(-) S is/am/are not V3/ed (by O)
(?) Is/Am/Are S V3/ed (by O)?

$\text{1.}$ A song was sung 
$\text{2.}$ I was called.
$\text{3.}$The bus was stopped 
$\text{4.}$My house was built by an architect.
$\text{5.}$A book wasn't bought.
$\text{6.}$That pizza wasn't eaten 
$\text{7.}$The dog wasn't fed.
$\text{8.}$They weren't told 
$\text{9.}$ Were they told ?
$\text{10.}$Was the car washed ?
$\text{1.}$The computers are fixed.
$\text{2.}$The clothes are washed.
$\text{3.}$The shoes are cleaned.
$\text{4.}$The house is painted.
$\text{5.}$The garbage is thrown.
$\text{6.}$The e-mail is sent.
$\text{7.}$The story is not read.
$\text{8.}$ The homework is not done.
$\text{9.}$The dessert is not eaten.

$\text{10.}$The restaurant is not closed.

→ Bị động thì HTĐ : S + is/am/are + Vpp + ( by O ) 

→ Bị động thì QKĐ :  S + was/were + Vpp + ( by O ) 

→ Nếu chủ ngữ ko xác định ( VD : they,people,we,somebody,... ) thì khi chuyển sang câu bị động có thể lược bỏ phần by O 

$#Keisha$