无被动语态的情况
1) 不及物动词或动词短语无被动语态：
appear, die, disappear, end , fail, happen, last, lie, remain, sit, spread, stand ,break out, come true, fall asleep, keep silence, lose heart, take place.
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.
2) 不能用于被动语态的及物动词或动词短语：
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，listen to，walk into，fall off This key just fits the lock.
Your story agrees with what had already been heard.
3) 系动词无被动语态：
appear, be, become, fall, feel, get, grow, keep, look, remain, seem, smell, sound, stay, taste, turn It sounds good.
4. 祈使句一般没有被动语态。
如：
正：Look at the blackboard，please.
误：The blackboard is looked at by you.
5. 宾语和主语所指的对象相同时不能用于被动语态。
如：
正：We must help each other.
误：Each other must be helped by us.
6. 某些及物动词的宾语表示处所、地点、组织时不能用于被动语态。
如：
正：He joined the League in 1998.
误：The League was joined by him in 1998.
7. 动词不定式或动词-ing形式作宾语时不能用于被动语态。
如：
正：They like to watch TV.
误：To watch TV is liked by them.
正：He enjoys listening to the radio.
误：Listening to the radio is enjoyed by him.
8. 主动句中有表示数量、长度、大小或程度的单词或短语作宾语时往往不使用被动语态。
如：
正：She pays three yuan for the tomatoes.
误：Three yuan is paid for these tomatoes by her.
9. 由“动词＋名词”构成的英语习语（如make faces，make friends，take place等）一般不可改为被动语态。
如：
正：The boy make faces in class.
误：Faces are made by the boy in class.
10. 反身代词在句中作宾语时，不能用被动语态。
如：
正：You must look after yourself.
误：Yourself must be looked after.
句子改错：
1. The boy was made cry by his sister.
2. The strange was let to go.
3. My coat is washed easily.
4. Her forehead is felt hot. I’m afraid she is ill.
5. Eggs won’t be kept long in summer.
6. Who was the book written?
7. English is not easy to be learnt.
8. The traffic accident was happened yesterday.
9. This desk needs to mend.
10. The People’s Republic of China was found on October 1, 1949.
11. Wet clothes are often hanged up near a fire in rainy weather.
12. Newly-born babies are taken good care in hospital.
13. The price has been risen.
14. Please seat.
15. I’ll come after the meeting if time is permitted.
16. A red sky in the morning says to be a sign of bad weather.
17. He is looked down because he is a liar.
18. A dictionary shall be given me by Father on my birthday.
19. An interesting story was told me last night.
20. They have married for 2 years.
21. I have got used to get up at six.
22.The book is well worth to be read.
23. He was laughed by them.
24. I was made do it.
25. Maths is difficult to be learned.
26. Great changes have been taken place.
27. I still don’t know what was happened just now.
28. The price of the cleaner has been risen quickly.
29. He read it as loud as possible so as to make himself hear.。
