1. 被动语态的构成：be + 过去分词
A building was damaged by the storm. 暴风雨毁坏了一座建筑物。
Our plate was made in China. 我们的盘子是中国生产的。
My bike was stolen. 我的自行车被盗了。
注意："be + 过去分词 " 并非都是被动语态，系动词 be, feel, seem, look, 等词后面的过去分词已转化为形容词，作表语用，表示某种状态。
I'm interested in mathematics. 我对数学感兴趣。
He seems unsatisfied with his work. 他看起来对他的工作不满意。
We are determined to catch up with the developed countries. 我们决心要赶上发达国家
The song is called "Don't forget me". 歌曲的名字叫 “ 勿忘我 ”
2. 常用的被动语态的时态变化如下，以 ask 为例：
一般 进行 完成
现在 I am asked, I am being asked, I have been asked
过去 I was asked, I was being asked, I had been asked
将来 I shall/will be asked, I shall/will have been asked
3. 情态动词 + be + 过去分词，构成被动语态
Coal can be used to produce electricity for agriculture and industry.
注意：若宾语补足语是不带 to 的不定式，变为被动语态时，该不定式前要加 "to" 。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. >> I was made to go out of the classroom (by the teacher).
We saw him play football on the playground. >> He was seen to play football on the playground.
4. let 的用法
1）当 let 后只有一个单音节动词，变被动语态时，可用不带 to 的不定式。
They let the strange go. >> The strange was let go.
2）若 let 后宾补较长时，let 通常不用被动语态，而用 allow 或 permit 代替。
The nurse let me go to see my classmate in the hospital. >> I was allowed / permitted to see my classmate in the hospital.
This is a photo of the power station that has been set up in my hometown.
My sister will be taken care of by Grandma.
Such a thing has never been heard of before.
6. 表示 " 据说 " 或 " 相信 " 的词组
believe, consider, declare, expect, feel , report, say, see, suppose, think, understand
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 has been decided that… 大家决定
It must be remember that… 务必记住的是
例如：It is said that she will leave for Wuhan on Tuesday.
appear, die disappear, end (vi. 结束 ), fail, happen, last, lie, remain, sit, spread, stand
break out, come true, fall asleep, keep silence, lose heart, take place.
After the fire, very little remained of my house. 比较：rise, fall, happen 是不及物动词； raise, seat 是及物动词。
( 错 ) The price has been risen.
( 对 ) The price has risen.
( 错 ) The accident was happened last week.
( 对 ) The accident happened last week.
( 错 ) The price has raised.
( 对 ) The price has been raised.
( 错 ) Please seat.
( 对 ) Please be seated.
fit, have, hold, marry, own, wish, cost, notice, watch agree with, arrive at / in, shake hands with, succeed in, suffer from, happen to, take part in, walk into, belong to
This key just fits the lock.
Your story agrees with what had already been heard.
appear, be become, fall, feel, get, grow, keep, look, remain, seem, smell, sound, stay, taste, turn
It sounds good.
die, death, dream, live, life
She dreamed a bad dream last night.
( 对 ) She likes to swim.
( 错 ) To swim is liked by her.
1)wash, clean, cook, iron, look, cut, sell, read, wear, feel, draw, write, sell, drive…
The book sells well. 这本书销路好。
This knife cuts easily. 这刀子很好用。
2) 在 need, require, want, worth ( 形容词 ), deserve 后的动名词必须用主动形式。
The door needs repairing. = The door needs to be repaired.
This room needs cleaning. 这房间应该打扫一下。
This book is worth reading. 这本书值得一读。
3) 特殊结构：make sb . heard / understood ( 使别人能听见 / 理解自己 ) ，have sth . done ( 要某人做某事 ) 。
be determined, be pleased, be graduated (from), be finished, be prepared (for), be occupied (in), get married
He is graduated from a famous university. 他毕业于一所有名的大学。
注意：表示同某人结婚，用 marry sb . 或 get married to sb . 都可。
He married a rich girl. He got married to a rich girl.
注意：当 need, want, require, worth( 形容词 ) 后面接 doing 也可以表示被动。
Your hair wants cutting. 你的头发该理了。
The floor requires washing. 地板需要冲洗。
The book is worth reading. 这本书值得一读。
The library needs___, but it'll have to wait until Sunday.
A. cleaning B. be cleaned C. clean D. being cleaned
答案 A. need ( 实意 ) +n /to do ， need ( 情态 )+ do ，当为被动语态时，用 need + doing. 表示被动。 如有 to be cleaned 则也为正确答案。