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摘要：英语使用被动式，常常是为了表示某种客观、间接和非人称的口气，以迎合某些表达需要。汉语要表达同样的口气，往往不用被动式，而用上述的无主句、主语省略句、主语泛指句以及其他句式。

英语常用被动句，主要有以下几方面的原因：

1、施事的原因

人们表达思想的时候，通常使用主动句。但当主动句的施事（agent）由于以下的原因而不需要或不可能指明时，英语往往采用被动句：

（1）施事从上下文中可以不言自明，如《母亲》中的：

They said patients should be sent to hospital for thrombosis as soon as possible.

就说要赶快赶到医院去溶栓。

（2）施事不如受事重要，或受事需要强调，如《母亲》中的：妈被搀扶着，后来竟不要他们搀扶了。

She was held in arm at first，and then dropped little brother’s hand to walk by her.

（3）由于特殊的原因而不要指明施事，如为了使叙述显得圆通、得体，或为了表达某种微妙的情绪（tact or delicacy of sentiment），例如《母亲》中的：

她忽然一阵发冷。这么想时她感到心里一下子被人抽去了温度，

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