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it's和it's a的区别用法,还有a用在哪里

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it's和it's a的区别用法,还有a用在哪里
it's和it's a的区别用法,还有a用在哪里
It's a 不是固定用法,a是个冠词,用在可数名词单数形式前：
It's bad.bad是形容词,不需要a;
It's bad weather today.weather是不可数名词,不需要冠词a；
It's a bad day today.day是可数名词单数,要用冠词a；
也就是说,a 和it's 不是固定的,a用不用要看后面.
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