没有被动语态的动词主动变被动时需注意
没有被动语态的动词
不及物动词，一些表示状态及拥有的及物动词，以及have, get, owe, belong to, cost等动词或短语动词没有被动语态形式。
This hall can hold 500 people.
这个大厅可以容纳500人。
The house belongs to my uncle.
这座房子是我叔叔的。
His careless driving cost him his life.
他的粗心让他丧了命。
不背单词电脑版
囧记单词
新概念英语青少版

主动变被动时需注意
1. 主动语态中若宾语补足语是省略to的不定式，变为被动语态时，该不定式前要加to。即被动语态中无不定式省to的情况。此类动词为感官动词 feel, hear, help, listen to, look at, make, observe, see, notice, watch。
The teacher made me go out of the classroom. 老师让我从教室里出去了。
→I was made to go out of the classroom (by the teacher). 我被（老师）从教室里请出去了。
We saw him play football on the playground. 我们看见他在操场上踢足球。
→He was seen to play football on the playground. 有人看到他在操场踢足球。
2. 情态动词+be+过去分词，构成被动语态。
 The classroom must be cleaned every day.      
教室必须每天打扫。

短语动词的被动语态
短语动词是一个整体，不可丢掉后面的介词或副词。
My sister will be taken care of by Grandma. 
奶奶将照顾我妹妹。
Such a thing has never been heard of before.
这样的事情之前没有听说过。
表示"据说"或"相信"的词组
It is said that… 据说
It is reported that… 据报道
It is believed that…大家相信
It is hoped that…大家希望
It is well known that… 众所周知
It is thought that… 大家认为
It is suggested that… 据建议
It is taken granted that… 被视为当然
It is said that she will leave for Wuhan on Tuesday.
据说她周二去武汉。
It’s taken granted that the children should take care of their old parents.
子女照顾年老的父母，这是理所当然的事情。

I am Peter Hodes , a volunteer stem cell courier. Since March 2012, I’ve done 89 trips—of those , 51 have been abroad. I have 42 hours to carry stem cells（干细胞）in my little box because I’ve got two ice packs and that’s how long they last. In all, from the time the stem cells are harvested from a donor(捐献者) to the time they can be implanted in the patient, we’ve got 72 hours at most. So I am always conscious of time. 
I had one trip last year where I was caught by a hurricane in America. I picked up the stem cells in Providence, Rhode Island, and was meant to fly to Washington then back to London. But when I arrived at the check-in desk at Providence, the lady on the desk said:“Well, I’m really sorry, I’ve got some bad news for you—there are no flights from Washington.” So I took my box and put it on the desk and I said:“In this box are some stem cells that are urgently needed for a patient-please, please, you’ve got to get me back to the United Kingdom.” She just dropped everything. She arranged for a flight on a small plane to be held for me，re-routed(改道)me through Newark and got me back to the UK even earlier than originally scheduled.
For this courier job, you’re consciously aware that in that box you’re got something that is potentially going to save somebody’s life.
1. Which of the following can replace the underlined word “courier” in Paragraph1?
A. provider        B. delivery man         C. collector        D. medical doctor
2. Why does Peter have to complete his trip within 42hours?
A. He cannot stay away from his job too long.
B. The donor can only wait for that long.
C. The operation needs that much time.
D. The ice won’t last any longer.
3. Which flight did the woman put Peter on first?
A. To London.   B. To  Newark.      C. To Providence.       D. To Washington.

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