We can change water into ice --------Water can be changed into ice.
She ought to tidy up her bedroom------Her bedroom ought to be tidied up.
You should buy a dictionary at once ----A dictionary should be bought at once by you.
(2) 否定式:主语+ 情态动词+not +be +过去分词+by
You must not take out any books .-----Any books mustn't be taken out by you .
They needn't look after the little child ----The little child needn't be looked after (by them)
(3) 疑问句:情态动词+主语+be +过去分词+by
Can you use it ?------Can it be used ?
常见的情态动词有:can,may, ought to, must , dare , need,should.
主动语态不能变为被动语态的情况:
1, 当宾语是反身代词时
The man introduced himself as Mr.Parker .
2,当谓语是表示状态的及物动词时
Does the pair of new shoes suit you?
We will have a meeting .
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