动词的语态3

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.




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

It is said that she will leave for Wuhan on Tuesday.



need/want/require/worth

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。

典型例题
　　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，还可need + doing. 本题考最后一种用法，选A。如有to be clean 则也为正确答案。
典：done，"不可能已经"。must not do 不可以（用于一般现在时)。