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一般过去时
did
was/were + done
现在进行时
am/is/are + doing
am/is/are + being done
现在完成时
have/has + done
have/has + been done
一般将来时
will/shall/be going to + do
will/shall/be going to + be done
过去进行时
was/were + doing
was/were + being done
含有情态动词
can/may/must + do
can/may/must + be done
被动语态中主语是动作的承受者，主要用于下列几种情况：
1.不知道动作的执行者是谁
The window was broken yesterday.
窗户昨天被打坏了。
2.没有必要指出动作的执行者是谁。
Many tall buildings are built in our city every year.
每年在我们的城市会修建许多高楼。
3.需要强调或突出动作的承受者。
English is taught in our school.
我们学校教授英语。
4.动作的发出者不是人。
Most of the houses were destroyed in the earthquake.