it用法归纳(高中英语)

“it” 两项重点用法Mar 4. 2011 这两项重点用法指的是强调句和it做形式成分。

一.强调句:
一）陈述句：
It + is / was + 被强调部分+ that / who … ( 强调人时可用who )
I met Tom in the street yesterday.
针对各个划线部分变强调句：
1) It was I that met Tom in the street yesterday.
2) It was Tom that I met in the street yesterday.
3) It was in the street that I met Tom yesterday.
4) It was yesterday that I met Tom in the street.
二）一般疑问句：
1) Was it I that met Tom in the street yesterday?
2) Was it Tom that I met in the street yesterday?
3) Was it in the street that I met Tom yesterday?
4) Was it yesterday that I met Tom in the street?
三）特殊疑问句：
1) Who was it that met Tom in the street yesterday?
2) Who was it that I met in the street yesterday?
3) Where was it that I met Tom yesterday?
4) When was it that I met Tom in the street?
四）特殊疑问句作宾语从句：
I forgot…
1) I forgot who it was that met Tom in the street yesterday.
2) I forgot who it was that I met in the street yesterday.
3) I forgot where it was that I met Tom yesterday.
4) I forgot when it was that I met Tom in the street.
结论：特殊疑问句作宾语从句时，主谓词序正常。

五）判断强调句的方法：
“It is / was … that…” 这个框架拿掉以后，句子仍然成立。

高考题：
I just wonder ___ that makes him so excited.
A. why it does
B. what he does
C. how it is
D. what it is （D ）
难点：
I did not go to bed until midnight.
It was not until midnight that I went to bed.
二. It 做形式成分：形式宾语和形式主语
一）it 做形式宾语
1. it 指代一句话。

1) I hate it when people talk with their mouths full.
2) I like it in the autumn when the weather is clear and bright.
3) I’d appreciate it if you would like to teach me how to use the computer.
2. it 指代不定式
I think it my duty to help you.
I think it necessary to read English newspapers.
I don’t think it possible to master a foreign language without much memory work.二）it 做形式主语
1. It is said that…
(known, reported, believed, hoped, thought，decided…)
It is known to us that a very important meeting is being held in our school.
2. It seem / appear / happen that…
It appears that every student is polite to teachers.
It happened that Li Lei was not polite that day.
3. It is + n. + that …
1) It is a fact that English is being spoken all over the world.
2）It is our hope that we can have a long holiday.
4. It is no use / a waste of time doing sth.
It is no use crying over spilt milk.
It’s a waste of time reading novels now.
5. It 指代不定式
1) It is important to learn English well.
2) _____ to go hiking!
A. How fun it is
B. What fun it is
C. What fun of it is
D. What a fun it is ( B )。