四六级考试 语法：it的用法

it的用法

一、人称代词it

1.指代无生命的东西

She put her jewelry in a fancy box and shut it.

2.指代动植物或婴儿

What a beautiful baby! Is it a girl?

3.指代所谈的事情或情况

He understood Japanese, but I was not aware of it.

二、先行代词it

1.作形式主语，代替不定式短语、动名词和主语从句

It is necessary to have a plan before doing any kind of work.

It is difficult getting out of the habit of sleeping late.

It was the rule of the school that the pupils should wear their school uniforms.

但是以下动词、分词和形容词引导的主语从句不能放句首，必须用it引入：appear, seem, happen, turn out, believed, expected, reported, rumored, thought, said, likely, unlikely, certain等

It seems that nobody knew what had happened.

It is said that most people in the village live to over one hundred.

It is likely that train fares will go up in the holiday season.

2.作形式宾语，代替不定式、动名词短语和宾语从句

The volunteers make it their business to take care of the old people in the local community.

I don’t think it worthwhile taking too much trouble.

We find it a mystery that Alex has never mentioned his parents.

三、非人称代词it

1.指时间

It was nearly Christmas when I heard Mother got a job at the railway station.

It is ten years since the pop singer made his first record.

2.指天气、季节

It will be spring in two weeks’ time.

3.指距离

It’s a long way to the nearest gas station.

4.指环境或情况

It’s too noisy for me to study here.

When it came to the future career, I was at a loss.

四、强调it

1.强调主语

It was Edison who produced the first talking film in 1912.

2.强调宾语

It was an abandoned baby that she saw in the waiting room.

3.强调状语

It was not until he got a map that he started on his way.

It might be in the store that I lost my purse.

五、it的习惯用法

Let’s call it a day.

I take it that you don’t want to do it.

He is not backward. It is just that he hasn’t studied hard enough.

After coming to the city he not only made it, but made it big.