为什么是If it doesn't rain tomorrow,we'll go there.而不是If it isn't.为甚莫不能用isn't?
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为什么是If it doesn't rain tomorrow,we'll go there.而不是If it isn't.
为甚莫不能用isn't?
if引导条件状语从句时,表示将来时态,主句是一般将来时态,从句要用一般现在时(主将从现原则) 一般现在时:it rains 或者it donesn't rain ,你如果放个be动词 也应该是it is raining 这是现在进行时态
你要用isn't,那就是进行时了,首先rain得变成raining了。
所谓进行时,就是这个动作正在进行。那么用在这里,逻辑就不对了。
如果用进行时,原句的意思就变成了:
如果每天不正在下雨的话,我们去那。。。。Be后面的动词必须是ing形式吗?如果be动词后“直接!”跟动词的话,那么那个动词必须是进行时态,即ing形式。...
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你要用isn't,那就是进行时了,首先rain得变成raining了。
所谓进行时,就是这个动作正在进行。那么用在这里,逻辑就不对了。
如果用进行时,原句的意思就变成了:
如果每天不正在下雨的话,我们去那。。。。
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rain这里做动词用,当然是doesn't,若这里用rainy(adj.),则应用If it isn't,或考虑使用虚拟语气。
rain是动词,所以要用助动词否定啊,is不能跟动词搭配,一般表示“是”的意思,而do一般表示“做”的意思。
因为rain在这里当下雨讲,是实义动词,变成否定借助助动词don't或doesn't
就像我们要说: He doesn't like summer. 而不说 He isn't like summer.一样
因为like 是实义动词
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