`11`/ The window should be opened.
`12`/ The little boy has to looked after.
`13`/ The house is cleaned everyday.
`14`/ The shops is opned at 7 a.m .
`15`/ The letter has not been sent yet.
`16`/ Houses was used to built of straw and mud.
`17`/ The room has not been decorated yet.
`18`/ Computers is used in all kinds of works.
`19`/ This kind of car is made a long time a go
Nhắc sơ:
Khi gặp thì passive voice ( thì bị động )
+ )S + to be + v / 3 + O.
- ) S + to be + not + v/ 3 + O.
? ) To be + S + v / 3 + O?
