一道英语选择题,请给出答案并说出理由I don't know if Jack will come .If he (.),call me,please.A.will comes B.come C.will come D.comes

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一道英语选择题,请给出答案并说出理由I don't know if Jack will come .If he (.),call me,please.A.will comes B.come C.will come D.comes

一道英语选择题,请给出答案并说出理由I don't know if Jack will come .If he (.),call me,please.A.will comes B.come C.will come D.comes
一道英语选择题,请给出答案并说出理由
I don't know if Jack will come .If he (.),call me,please.
A.will comes B.come C.will come D.comes

一道英语选择题,请给出答案并说出理由I don't know if Jack will come .If he (.),call me,please.A.will comes B.come C.will come D.comes
一道英语选择题,请给出答案并说出理由
I don't know if Jack will come .If he______ ,call me,please.
A.will comes B.come C.will come D.comes
答:D
译:我不知道杰克会不会来.如果他来了的话,请给我打电话.
分析:第一句中的if=whether,引导的是宾语从句,不是条件状语从句.Jack还没有来,会不会来还不知道,该用将来时态还是用将来时态.后一句中的if从句为条件状从句,我们知道:在时间和条件状语从句中,用现在时态表示将来:
1.If Jack comes tomorrow,I will tell him about it.如果杰克明天来的话,我会告诉他的.
2.When Jack comes tomorrow,I will tell him about it.明天杰克来的时候,我会告诉他的.
这道题出得很好.两个if,一个用will come,一个用comes
AB楼主会排除,不用我说了吧?

选D 。 我不知道Jack 是否会来。如果他来了,请给我打电话。排除A和B。will 后面只跟动词原形。一般现在时主语三单后动词要变形。
条件状语从句,if 意为在...条件下。不用将来时,排除C。

D
该句第一个if表示“是否”,第二个if表示如果,此时结果尚未发生,是虚拟语气,时态提前一级,用一般现在时。

D
if 在这里是如果的意思,如果他来了,就请打电话告诉我。用一般现在时态表示将来时态。也就是说用comes表示将来时态。

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