作业帮Shall we be back in time-----这句子中为什么要加be（我不是问：为什么要用be 动词原形）!
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Shall we be back in time-----这句子中为什么要加be（我不是问：为什么要用be 动词原形）!
Shall we be back in time-----这句子中为什么要加be（我不是问：为什么要用be 动词原形）!
Shall we be back in time-----这句子中为什么要加be（我不是问：为什么要用be 动词原形）!
去掉be 动词不行,那样这句就没有动词了,shall只是助动词,它后边必须有个动词原形.
用现在时说,We are back是成立的,而We back则不成立（缺少谓语动词）,We are back改为将来时,就是We shall be back,加状语in time,再改为疑问句,即是此句.
都是骗人的
back 在这里是一个副词，be在这才是动词，是谓语。
shall 是情态动词，后加动词原形 不行，back不是动词，shall后应为动词原形，所以加了be
Shall we be back in time-----这句子中为什么要加be（我不是问：为什么要用be 动词原形）!
WE WILL BE BACK
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