题目内容
15.I don't know when my father __________ back,but I'll tell you when he ______ back.( )| A. | comes,comes | B. | come,come | C. | come,will come | D. | will come,comes |
分析 我不知道我爸爸什么时候回来,但是当他回来时,我就告诉你.
解答 答案:D 根据I don't know when my father可知,考查宾语从句,when引导的是宾语从句,表示"什么时候".当主句是一般现在时态,宾语从句应该根据需要选用任何时态,此句动作没有发生,应该用一般将来时态;又因为but I'll tell you when he ______ back可知,when引导的是时间状语从句,当主句是一般将来时态,从句应该用一般现在时态,我们称这一现象为"主将从现",主语是he,谓语动词是第三人称单数形式,故选D.
点评 本题考查宾语从句和状语从句,when可以时间状语从句,当主句是一般将来时态,从句应该用一般现在时态;when还可以引导宾语从句,当主句是一般现在时态或含情态动词的句子,宾语从句应该根据需要选用任何时态.
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