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关于被动语态的问题a truck is running over a bag,变成被动语态,答案写的是a bag is

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关于被动语态的问题
a truck is running over a bag,变成被动语态,答案写的是a bag is being run over by a truck,为什么不是a bag is running over by a truck
上面说错了,为什么不是a bag being run over by a truck?
关于被动语态的问题a truck is running over a bag,变成被动语态,答案写的是a bag is
现在进行时的被动语态是am/is /are +being done.
a bag is running over by a truck.是不对.的
a bag being run over by a truck就不说句子了.
如果是being run over by a truck,那就是非谓语动词,做后置定语.
再问: the hospital being built is just near our scool.这句话为什么只有一个be
再答: being built是非谓语动词,也就是v-ing的被动形式,做的是后置定语. is 是句子的谓语动词.