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It often rains in summer and it often snows in winter in this city.
这个城市夏天经常下雨，冬天经常下雪。
4.it指距离、情况等。一般用作无人称动词的主语。
例如：
It is five kilometers from my home to the school.
从我家到学校有五公里。
It is very near from this factory to that one.
从这个工厂到那个工厂非常近。
It is a long way to the sea. 离海很远。
Is it well with you? 你身体好吗?
二、it作形式主语
动词不定式、动名词短语起、从句在句子中起主语作用，而这一部分用词较多时，可以用it作为形式主语，放在句首代表其后所说的事实上的、真正的主语，而把真正的主语放在后面。
1.It +谓语+动词不定式。It 作形式主语，动词不定式作真正的主语。
例如：
It is difficult to climb a mountain. 爬山是很艰难的。
It’s a good habit to do morning exercises. 作早操是个好习惯。
It’s important to do proper memory work in the study of a foreign language. 在学习外语时适当地做一些有助于记忆的练习是很重要的。
It is right to do so. 这样做是对的。
2.It+谓语+动名词短语。It 作形式主语，动名词短语作真正的主语。
例如：
It is dangerous playing with fire. 玩火是危险的。
It is no use learning without thinking. 学而不思则罔。
It’s useless arguing with a silly boy. 和笨孩子争论是没有用的。
3.It +谓语+名词性从句。It 作形式主语，以that 引导的名词性从句是真正的主语。
例如：
It is a pity that you didn’t see such a good film.
你没看这么好的电影，真可惜。
It is certain that we shall succeed. 我们一定会成功。
It is strange that nobody knows where he lives.
真奇怪，谁也不知道他住在哪里。
(It is strange that…后面可用虚拟语气。
如：It is strange that he should have made such a mistake.
他居然犯了这样一个错误，真奇怪。
It is strange that nobody should know where he lives.
居然没有人知道他住在哪里，真奇怪。)
It is said that the plane will take off at ten tomorrow morning.
据说飞机明天上午十点起飞。
n. 同情，怜悯，遗憾，可惜
v. 同情，怜悯
