被动语态（passive voice）是动词的一种形式，用以说明主语与谓语动词之间的关系。
被动语态表示主语是动作的承受者
助动词be+及物动词的过去分词
主动语态：do
被动语态：be done
主动语态：will/shall do;be going to do;be to do
被动语态：will/shall be done;be going to be done;be to be done
主动语态：did
被动语态：be done
主动语态：have done
被动语态：have been done
主动语态：be doing
被动语态：be being done
主动语态：had done
被动语态：had been done
主动语态：was/were doing
被动语态：was/were being done
主动语态：情态动词+do
被动语态：情态动词+ be done
谓语动词带双宾语，变成被动句时
用for/to引出表示人的宾语 My father is telling me an interesting story now.
An interesting story is being told to me by my father now.
I'm being told an interesting story by my father now.
make/hear/see sb. do sth.变为被动句时+to His words made me throw up.
I was made to throw up by his words.
People often laughed at the old man.
The old man was often laughed at by people.
He would be given a doctor's degree.
He would not be given a doctor's degree.
结构：to be done
意义：和谓语动词同时发生
结构：to have been done
意义：发生在谓语动词前
It's a pity to be kept in the house in such fine weather.
这么好的天气一直待在屋子里真是遗憾。
The boy asked to be given an opportunity to try again.
男孩要求再给一次尝试的机会。
Her dream is to be sent to study abroad.
她的梦想是被派往出国留学。
The captain ordered the flag to be raised.
船长命令升旗。
There were plans to be made at once.
要立即制定计划。
His mother left the small village，never to be seen again.
他的妈妈离开了那个小村庄，再也没有人见过她。
to do和名词时间有动宾关系。
句子的主语又是to do的执行者（逻辑主语） He has a family to support.
他要维持一个家庭。
I will go to the post office.Do you have a letter to be posted?
我要去邮局，你有信要寄吗？
That question is difficult to answer.
这个问题很难回答。
The factory is to blame for the pollution.
污染应该归咎于工厂。
I had no idea which book to read frist.
我不知道先读哪本书。
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