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一般过去时
was/were done
情态动词
Can/may/must/
should be done
Attention I.感官动词，使役动词, help —— 不定式前添加 to
a.感官动词
hear, see,watch
sb be seen/heard/watched doing sth
b.使役动词
let, make
c.help
help sb (to) do
sb be seen/heard/watched to do sth
sb be let/made to do sth
sb be helped to do sth
The boss made the workers work all day.
I often hear her sing in the room.
We saw some boys entering the building at that time .
The workers were made to work all day.
She is often heard to sing in the room .
Some boys were seen entering the building .
II. 双宾语结构 —— 主语为物，添加
He gave us some books.
主语 谓语 间宾 直宾
注意：常把间接宾语(即sb)变为主语。
We were given some books (by him).
若把直接宾语(即sth.)变为被动句的主语时，常在保留宾语前加to或for。
Some books were given to us (by him).
Some books were bought for us