英语主动形式表被动的几种情况归纳
 一．某些表示状态特征的系动词，如：sound, seem ,smell, taste, look ,feel.,有时用主动形式表被动意义。
The music sounds wonderful.
The flowers smell sweet.
The apples taste delicious.
二．某些表主语内在品质或性能的动词如：lock, sell, wash, read  ,write, open, wear, keep其主动形式表被动意义。
The door won’t lock.
These books sell well.
Does the cloth wash well?
三．作表语用的一些形容词如：easy, difficult, hard, nice, possible, impossible等后面作状语的不定式，其主动形式表被动意义。
I think English is easy to learn.
The physics problem is not difficult to work out.
四．不定式作定语，又与所修饰的名词或代词存在逻辑上的动宾关系，此时的主动形式表被动的意义。
I have a lot of work to do today.
require名词He has some questions to ask.
Would you like something to drink?
五．“too-----to”结构中的不定式的主动形式表被动的意义.
The box is too heavy to carry.
The sentences are too difficult to translate.
六．在“疑问词（what, which, whom）+不定式”的结构中，不定式的主动表被动意义.
She will tell you which to choose.
I don’t know what to do next.
七．形容词worth 后接的动名词以及need, require等词后面的动名词用来表被动意义。
This book is well worth reading.
The film is worth seeing.
The baby needs looking after.
八．某些只能用做不及物的动词或短语如：happen, take place等，其主动形式表被动意义。
The traffic accident happened two hours ago.
Great changes have taken place in our school.

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