it作代词的用法及讲解
1、用作人称代词（personal it）
代替前文提到过的事物，it作真实主语或宾语。
The frog is not a warm-blooded animal. It is a cold-blooded one.青蛙不是温血动物，它是冷血动物。
My pen is missing. I can't find it anywhere. 我的笔丢了，我哪儿也找不到它了。
I won't be back tonight. Please tell my wife about it .我今晚不回来了，请你向我妻子说一声。
I was disappointed with the film. I had expected it to be much better. 我对这部电影很失望，我曾盼望它更好。
Tom's mother kept telling him that he should work harder, but it didn't help.汤姆的妈妈不停地告诉他要努力，但这没起作用。
用记忆术记英语单词
随时随地背单词
每天背多少个单词最好

2、用作指示代词（demonstrative it）
相当于this或that，it有时不特指某件东西，而代表前面已提到的或将会发生的某件事情。
-Who is knocking at the door? —谁在敲门？
-It's me. —是我。
I had a talk with the student. It was very helpful to her. 我和那个学生谈了次话，对她非常有帮助。
It happened during my stay in the United States. 事情发生在我在美国的时候。
-Whose exercise book is that? —谁的作业本？
-It's his . —是他的。

3、用作非人称代词（impersonal it）
代词it可用来指除人以外的一切生物和事物，无阴阳性之分。可指时间、距离、度量、价值、自然现象（天气、气体、阴暗等）。
-What's the time? —“几点了？”
-It's half past ten. —“十点半”（指时间） 
It is late autumn now. 现在是深秋。（指时间）
It is rather cold today, isn't it?今天很冷，是不是？（指天气）
-How far is it from here to the station? —从这儿到车站有多远？
-It's about two kilometers. -大约两公里。（指距离） 
It is raining hard. 雨下得很大。（指自然现象）
-What's the cost of the dictionary? 那本词典多少钱？
It is sixty-three. 六十三元（指价值）
It did not snow much last winter. 去年冬天雪下得不多。（指自然现象）

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