for a walk to the park even though it was 2
miles away. He未w知a的s 人just about when someone knocked at the door.
“Who isit ?”,he thought. When he opened
形式主语
引导词 it
1、It was so comfortable to walk on the street .
形式主语
真正主语
= To walk on the street was so comfortable .
2、It is no good smoking. = Smoking is no good.
（2）It is + adj. + （of sb. ） to do sth.
此处adj. 通常为描述人的形容词： kind; rude; silly ， careful; careless; foolish; stupid; clever; wise ...
It 's kind of you to help me with the problem .
--- It's hers.
--- What's this?
--- It' s a flag .
3. 用以代替未知的人或婴儿。 Someone is knocking at the door. Go and see who it is.
代词 it
4. 做非人称代词，指代时间、天气、距离、
环境、季节、日期、价值等。
= You are kind to help me with the problem .
（3）It is + 名词 + to do sth.
常用的名词有： fun; pity, shame, pleasure... e.g. It is fun to go out for a walk.
不可数名词 It is a shame to be late for class It is a pleasure to have the chance to help you.
Grammar
The use of “it”
How much do you
know about “it”?
引导词 it
代词 it
The Use of “it”
It 句型归纳 Sentences With “it”
代词 it
your body
1. 做人称代词，代替前文提到过的事物。
You body becomes accustomed to having nicotine in it.
It's time for class.
时间
It is summer now and it gets hotter and hotter.
季节
天气
It's about two kilometers from here to my home. 距离
It is very quiet in our classroom every night.
As you know, if you do the same thing over and over
again, you begin to do it automatically .
2. 用以代替指示代词 this, that 。
the thing
--- Whose text-book is that?
常见的adj. 有:possible;clear;obvious;true,etc
It is very clear that he grows like a tree. (2) It is + n. + that 从句
常见的n.有:a shame; a pity, a fact,etc
It is a pity that you missed the football match. (3) It is + v-ed + that 从句 It is said (reported/believed/ thought/known/ told/ suggested.....) that ... 译为“据说（据报道，据 悉… ）”。 It is said that he has gone to Beijing. (4It)iIstrheappopretends/tsheaetmCsh/aaiprmpeaanrsX+i wthilal tvisi从t H句angzhou. It seems that there is no way out of our difficulty.
形式主语 真正主语 3、It is am amazing that at my age I am still fit.
形式主语
真正主语
= That at my age I am still fit is amazing.
Summary ： it作形式主语 ，代替由不定式（或不 定式复合结构）、动名词或从句表示的真正主语。
the door, he found nobody but a note on the
ground. He picked it up and read. It is
surprising that the note should have been
given to his neighbour. note
---What's the date today? ---It's May 15, 2013.
日期
环境
---What's the cost of the T-shirt?
---It is 150 yuan.
价值
the use of it
天气
距离
It was a sunny day. Peter decided to go
（1）It is+ adj.+ （for sb. ）to do sth.
此处adj. 通常为描述事件 的形容词： easy; hard; difficult; necessary; likely; impossible; important; useful; dangerous…
It is important for a teenager to learn English well .. = to learn English well is important to for a teenager
(4) It takes Sb. some time to do...
e.g. It took me 3 days to prepare this lesson .
(5) It's no good/use doing…
e.g. It's no use crying over spilt milk.
(1) It is + adj. + that 从句