What ________ if there ______ no water or air on the earth?A．happen, isB．will ha
题型：不详难度：来源：
What ________ if there ______ no water or air on the earth?| A．happen, is | B．will happen, is | | C．will happen, will be | D．happen ,are |
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答案
| B |
解析
试题分析：句意：如果地球上没有水和空气，将会发生什么？根据句意判断，句子要用一般将来时，water为不可数名词，并且if 引导的状语从句用一般现在时表示将来所以用单数is ，故选B
点评：此考点也是中学英语中最喜欢出现的考点，if除了可以引导条件状语从句外，还可以引导宾语从句，翻译成“是否”。引导宾语从句时没有“主将从现”的说法。除了if外，还有when, as soon as也一样要注意“主将从现”。 |
举一反三
While he_____ on the phone, a man walked into his room.| A．was talking | B．talked | C．is talking | D．talk |
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---Sorry, I don’t know what the teacher said just now.
----He asked Maria ________.| A．how long she usually spends on her homework | | B．what she was doing these days | | C．why didn’t Mike come to the meeting yesterday | | D．when the speech will begin |
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| He said he _____to the beach every Saturday. |
－I"m so sorry that you didn"t win the skating marathon.
－How long _____ you ______?
－I skated for 5 hours.| A．have, been skating | B．were, skating | | C．have you skated | D．did, skate |
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What_____ you _____at eight yesterday evening?| A．have, done | B．did, do | C．were , doing | D．are, doing |
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