[已解决问题] 关于不定式的被动语态
什么时候加BE？
问题补充：she was sent abroad to be trained.这句中的to能去掉吗？为什么不能说she was sent abroad to trained.请帮我分析一下，在什么情况下要加be动词，什么情况下不用。像这句they were forbidden to stay out after midnight.为什么不用不to be stay out?
问题补充：she was sent abroad to be trained.这句中的to能去掉吗？为什么不能说she was sent abroad to trained.请帮我分析一下，在什么情况下要加be动词，什么情况下不用。像这句they were forbidden to stay out after midnight.为什么不用不to be stay out?
最佳答案
She was sent abroad to be trained. To当然不能去掉，而且肯定要用to be trained，这里是用做被动态。你可以体会一下，这句和第二句的结构不是太一样，She was sent abroad， she would be trained. 两个动词的对象都是She，所以后面也要用被动。
再看第二句，They were forbidden to stay out after midnight.
They were forbidden， they stay out after midnight. 象第一句一样把第二句分开，意思就和原句不一样了吧。因为第二句里的to stay our不是跟着They的，而是跟着forbidden的。而forbidden已经用了被动了，后面的就不用了。
仔细体会一下。具体的语法我也不太说得清楚，只能大概告诉你怎么理解。
2008-5-30 1:47:37
回答者：tigerzi
提问者对于答案的评价：虽然还是懵懵懂懂的，但是有些语法越解释越糊涂。谢谢！
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