被动语态

被动语态的时态及其构成
1 一般时  be+动词-ed (一般现在时和一般过去时)
We are moved by her sad story.
History is made by the people.
The coat was washed yesterday.
A lot of buildings were built last years.
2 将来时 will/shall + be + 动词-ed(would/should 表过去将来时)
This issue will be discussed tomorrow.
I shall be taught next year.
3 进行时(will/shall/would/should )be being+动词-ed形式
A letter is being writen.
I am being taken to the island.
Many people are being killed in the disaster.
The city was being developed.
Many trees were being cut in the old days.
4 完成时 (will/shall/would/should) have/has/had +been+动词-ed
The project has been completed.
The streets have been widened.
The light had been turned off when I came back.

5 带情态动词的被动语态
can/may/must + be done
Sometimes , had thing can be turned into good things.
The careless man should be criticized.
He should/ought to have been warned.
That question needn't be discussed.