Ⅰ.“It”的用法

1.代词it

(1) 指除人以外的一切生物和事物。

I hope it was as good as the one you lent me.

I knew at once that it was a gift from Father.

The more carbon the steel contains, the harder it is.

(2)在某种情况下代词it也可以指人。这时可把it看作指示代词。例如：

Is it your brother?

I didn't know it was you.

"Oh? who was it?" Mr. Black asked.

(3)it用来表示自然现象、时间、距离等。

① It is nine sharp now.

② It is very hot today.

③ It is far to the airport.

2.it 作形式主语

1)做不定式的形式主语

It’s nice to be with you.

It’s not easy to get him to change his mind.

Is it possible to go by bike?

2)that…句的形式主语

It’s true that she’s ill.

It seems obvious that we can’t go on like this.

It occurred to me that she might have forgotten the date.

3)作whether, when, what, if, how many 引导的句子的形式主语

It doesn’t matter whether you go or not.

matter：作名词，“物体，事物”

作动词，相当于“be important”

It doesn’t interest me whether you win or not.

It doesn’t matter when you arrive—just come.

It wasn’t very clear what she meant.

4)作动名词的形式主语

It was nice seeing you.

It’s unusual her going off like that.

It’s no use trying to explain—I’m not interested.

3.It作形式宾语

1)如果一个带有宾语补足语的动词不定式做宾语或一个宾语从句太长，可以用it作该不定式或宾语从句的先行词—形式宾语。本文|由职业培训教育网独家整理。 

George made it clear that he disagreed.

She thinks it easy to understand a letter written in English.

She found it difficult to get along with him.

He felt it his duty to help her.

4.用于强调结构中的it

这种结构的句型是：It+is(was)+被强调的部分+that(或who)+其他部分。

It is the force of gravity that makes heavy things fall toward the ground.

It is from the sun that we get light and heat.

It was the girl’s eyes that he had seen in the darkness.

Ⅱ.职称英语测试点：

1)It is estimated that by 1996, 61 percent of American managers will be using some sort of electronic work station.

2)It is believed that the Eskimos moved there from Mongolia or Siberia, probably crossing Bering Strait, named for Vitus Bering, the Danish sea captain who discovered Alaska on his voyage for Russia in 1741.

3)In an age where science fact frequently overtakes science fiction, the writers may find it difficult to keep ahead of scientific advances.

4)It is true that manufacturing jobs have declined. It is also true that there has been growth in some low-paying service jobs.

5)Traditionally, it has been the workers’ role to work and management’s role to manage.

6)It is natural and normal for language to change.

7)It can take many days for a human body to accept the major change in work hours.

8)It was in 1945 that Ruth and Elliot handler joined with their close friend Harold Mattson to form a company that would be known for the most famous and successful doll ever created.

9)It was in 1958 that the patent for Barbie was obtained.

10)It is the neurohormone that controls our sleep and tells our body when to sleep and when to wake.