代词 it | 玄数

2015-05-16

it的用法

1.  指代事物、动物、婴儿、未知的人

What is the sound?  It is the wind shaking the door.

2.  指天气、时间、距离、自然现象、环境等

It is sunny today.

3.  用作先行代词,替代不等式、动名词、名词性从句,作形式主语或形式宾语

It took me a month to finish the thesis.
原型为 To finish the thesis took me a month.   用 it 作形式主语替代不等式 to finish the thesis
It is worthwhile making another try.
原型为 Making another try is worthwhile.  用 it 作形式主语替代动名词 making.
It happened that she was not at home when I called.
用 it 作形式主语替代由 that 引导的名词性从句 She was not at home when I called

4.  用于强调句,去掉 “ it is … that … ”,剩余部分仍能组成一完整句子。

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

练习. He made many mistakes in his composition because of ________ .

A. careless B. careful C. carelessness D. carefulness
答案(把鼠标放上即可看到)