被动语态是动词的一种形式,它表示主语和谓语的关系,如果主语是动作的承受者,或者是说动作不是由主语而是由其他人完成的,则用被动语态.
例句：
Two people were killed and twelve were injured.两人死亡,十二人受伤.
The soldier was killed,but the train was saved.这位战士牺牲了,然而列车得救了.