1.She able to help you if you tell her.A.no;didn't B

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1.She ____able to help you if you ____tell her.A.no;didn't B.not;don't C.won't be;didn't
D.won't be;don't
2.What would happen if he ______back home?
A.go B.goes C.went
第一题答案是D,第二题答案是C为什么?不是说条件状语从句遵循主将从现吗?为什么第一个遵循?第二个不遵循?给我详细的解析,

这样看!
把第二题用第一题的时态就是：
What will happen if he goes back home?
上面这句是成立的吧,和第一题一样遵循主将从现.
然后整个句子全部倒退一个时态就是：
What would happen if he went back home?
这样过能理解了吧.
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再问：那怎样判断句子是否是虚拟语句？
再答：看与现实的情况是否相反相反就是虚拟不相反就不是虚拟
再问：那就是说第二句的现实情况是“他没回家”？就是这句话把“他没回家”给虚拟成“他回家后会发生什么?”
再答：恩
再问：如果以后我在碰到这种题，我就应该先判断它是不是虚拟语句？
再答：是的

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