It ____ snow very often in Shanghai.

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It ____ snow very often in Shanghai.
A.isn't B.doesn't
还有请回答我的问题:
1.为什么要选这个?
2.is和are在这样类型的句子中怎么区别啊?我老是做错
3.句中very 有用法和例句最好.
请快一些,

选B
1.这里的snow 作下雪解是动词
一个句子里面只能有一个动词,所以前面能用助动词
或者,这个句子的肯定形式是It snow very often in Shanghai,而改为否定的规则是否定 be 动词,没有be动词的用助动词帮助,这个肯定句中没有be动词,所以要用上助动词
2,is 和 are 都是属于be动词,他们的区别就在于 is的主语是单数的,比如说it,a tree,a man等而are的主语是复数的,比如说 those（那些） two men 等
it 作主语通常是要用 is 的
3,very often 是一个表示频率的副词短语功能普通的副词是一样的
意思是经常很频繁
例：I go to labrary very often (我经常去图书馆）

It ____ snow very often in Shanghai. ( )it often snow in winter here?Not very often ,but there ( it often _____（ snow ）in winter Does it ____ snow in Beijing. It often _______(snow)here in NT in.in winter. does it often snow in winter in beijing? 用所给动词的适当的形式填空:(snow) It ____,and the weather in very cold. It's [ ][snow] in Moscow and it's very cold. It is snowing in Harbin,it is very -------{snow} 连词成句winter,often,it,there,snow,does,in it's often __(snow)in winter here 适当形式填空：1 In winter ,it's often ( )(snow).Look!it is ( )(snow