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① 不知道谁是动作的执行者(即不知道谁做)时用被动语态,省略by短语。
如：A man was killed in the accident.(一个人死于事故)/ This window was broken yesterday.
(这扇窗子是昨天被打破的)
②不说或者众所周知是谁做时,用被动语态,省略by短语。如：Rice is also grown in this place.
(这个地方也种水稻)/ A railroad will be built here in three years.(三年之后这里将要修建一条铁路)
③强调动作的承受者,句尾加by短语。如：It was written by Lu Xun.(它(书)是鲁迅写的)/ A pet dog is never killed by its owner.(宠物狗是不会被主人宰杀的)
(2) 主动语态如何改写为被动语态：
主动句： 主语(人/物) + 谓语(及物动词) + 宾语(人/物) + 其他 + 状语
(动作的执行者) (各种时态形式) (动作的承受者)
被动句： 主语(人/物) + 谓语(及物动词) + by +人 / 物 + 其他 + 状语
(动作的承受者) (be +过去分词) (动作的执行者)
(3) 注意点：
①“动词+间接宾语+直接宾语”改为被动时,可以用间接宾语做被动句的主语。如：
His teacher gave him a dictionary.→He was given a dictionary by his teacher.
(老师给他一本字典→他得到老师一本字典)
也可以用直接宾语做被动句的主语,但是需用to或者for引出原句的间接宾语。如：His teacher gave him a dictionary.→A dictionary was given to him by his teacher
.(老师给他一本字典→一本字典由老师送给了他)/His father made him a kite.
→A kite was made for him by his father.(他的父亲给他做了一个风筝→一个风筝由他的父亲做给了他)
②“动词+宾语+动词原形”改为被动时,动词原形前要加to.如：The boss made the poor man work 12 hours a day.→The poor man was made to work 12 hours a day
(老板让这个可怜的人一天工作12小时→这个可怜人被迫一天工作12小时)
③“动词+…+介词”改为被动时,介词一般在原位不动。如：The girl takes good care of her little brother.→The girl’s little brother is taken good care of by her.(女孩照顾小弟弟→女孩的小弟弟由她照顾着)
④“be+过去分词”未必表示被动语态,而可能是系表结构。如：
He is pleased / worried / tired /…….(系表)(他高兴/焦虑/疲劳……)
He was hit / knocked down / told / shot / …….(被动)(他被击中/撞倒/关照/射中……)
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