英语主动句语法：不能变成被动式的主动句
这些主动句在下列情况下一般不能变为被动语态。
(1)主动句的宾语是反身代词或者互相代词时，不能转换成被动语态。比如：
They can express themselves in English after four years’ study.
学了4年英语后，他们能用英语来表达自己了。
不能变成：Themselves can be expressed in English by them after four years’ study.
They often help each other.
他们经常互相帮助。
不能变成：Each other is often helped by them.
(2)在主动句中，宾语之前如果带有形容词性物主代词时，不能转换成被动语态。比如：
The girl waved her hands to them.
那个姑娘向他们挥动双手。
不能变成：Her hands were waved to them by the girl.
They cut their way through the forest with their axes.
他们用斧子在森林里开辟道路。
不能变成：Their way was cut by them through the forest with their axes.
(3)主动句的宾语是动名词或者不定式时，不能转换成被动语态。比如：
She enjoyed playing table-tennis.
她喜欢打乒乓球。
不能变成：Playing table-tennis is enjoyed by her.
They refused to believe us.
他们不肯相信我们。
不能变成：To believe us was refused by them.
(4)主动句的宾语是谓语的同源宾语时，不能转换为被动语态。比如：
Last night he dreamed a beautiful dream.
昨夜他做了个美梦。
不能变成：Last night a beautiful dream was dreamed by him.
The working people led a miserable life before liberation.
解放前劳动人民过着悲剧的生活。
不能变成：A miserable life was led by the working people before liberation.
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