谁能告诉我that,this,it的用法在用代词的时候,往往会碰到让你选that,this还是it.对于这三个词到底选哪个,我拿捏的不是非常好,

谁能告诉我that,this,it的用法在用代词的时候,往往会碰到让你选that,this还是it.对于这三个词到底选哪个,我拿捏的不是非常好,
谁能告诉我that,this,it的用法
在用代词的时候,往往会碰到让你选that,this还是it.
对于这三个词到底选哪个,我拿捏的不是非常好,

谁能告诉我that,this,it的用法在用代词的时候,往往会碰到让你选that,this还是it.对于这三个词到底选哪个,我拿捏的不是非常好,
可以近处的东西用this,远处的用that
This
pron.这,本
a.这,本
ad.这么
例句 This ship docked this morning.
这条船是今天早上靠的码头.
.This new approach is
新方案有：
.A downpour this afternoon
下午有瓢泼大雨
.For this particular purpose
为某一特别目的
.Move this heavy box
把这重箱子挪动
Pecified by doing this
将某物挤成某形状、大小等
Person who does this
（使人感到）忧愁的,沮丧的
.Shop operating this system
现款自运商店（实行上述制度的商店）
.Wish this delay tolerate
望原谅我的延误.
.This work continues.This story goes on.
这项工作必须继续下去.
.
that 用法
pron.
1.那;那个,那人,那事,那东西
That's my English teacher over there.
那边是我的英文老师.
2.(已被提到的)那个,那人,那事,那东西
Who told her that?
那是谁告诉她那件事的?
3.前者
4.(用作关系代词的先行词)那,那个
What is that which you have just stuffed into the plastic cup?
你刚才塞在塑料杯里的是什么东西?
5.(代替句中名词,避免重复)
The output of steel this year has increased by 20% compared with that in 1992.
今年钢产量比一九九二年增长了百分之二十.
6.(用作关系代词,引导关系从句)
a.
1.那,那个
That book isn't mine.
那本书不是我的.
ad.
1.【口】那样,那么
Is the problem that easy?
问题有那么简单吗?
conj.
1.(引导名词从句)
He expressed the hope that we would keep in touch with his firm.
他表示希望我们与他的公司保持联系.
My idea is that we should act on his suggestion.
我的意见是我们应当按照他的建议去办.
That she is still alive is a relief.
她还活着,这是令人感到宽慰的.
2.(引导状语从句,表示原因或理由)因为,由于
We are glad that we have accomplished another arduous task.
我们都感到高兴因为又完成了一项艰巨的任务.
3.(引导状语从句,表示目的或结果)为了,以至于
He is working hard that he can catch up with the class.
他努力用功,以便赶上班上同学.
4.(引导表示愿望,感叹的从句,主句常省略)
That I could stay at home today!
今天要是我能呆在家里多好呀!
IT 的用法
1.做代词,代替刚提到的过的一件事情.
a.可以指一个具体的东西.b.可以指前面所谈的事情或情况.
eg.a.It’s a nice room.
b.You promised to write the article,and you must do it.
2.做代词代替指示代词 this,that
eg.---What’s this?------ It’s a flag.
3.起指示代词的作用,指一个人或事物,it 所指的东西不很具体.
a.有时指某个动作的人.b .有时指引起某种情况的事物.
eg.a..----Who is knocking at the door?---- It’s me.
b.It’s the wind shaking the window.
4.指环境,情况等.
eg.It’s very quiet at the moment.
5.指自然现象（天气,气候,明暗等）
eg.I’s getting cold (dark,late,etc.).
6.指季节,时间
eg.It was late autume (early spring,mid summer,etc).
7.指距离
eg.It’s only five miles (half an hour’s walk).
8.用于强调结构,在这里it 可以说没有意思.它只帮助改变一个句子的结构,使某一成分受到强调,改变结构的办法是：
IT + be + 要强调的部分+ that(who,whom) + 句子其他部分
强调的部分是人用who(m),其他情况多用that
eg.It was Mary who (that) met your sister in the zoo yesterday.
It was your sister that (whom) Mary met in the zoo yesterday.
It was in the zoo that (where) Mary met your sister yesterday.
9.做形式主语,代替一个由不定式,动名词短语或是从句表示的主语,使原来的这些主语可以放在句子后部,避免头重脚轻.
a.真正的主语是不定式.
Eg.It’s our duty to attend to this letter.
b.真正的主语是动名词.
Eg.It’s no use talking to him about it.
c.真正的主语是从句,这个从句可以用that 引起,也可以用一个连接代词或连接副词引起.
Eg.It happened that I wasn’t there that day.
It’s doubtful whether she will be able to come..
10.做形式宾语,代替一个由不定式,动名词,或是宾语从句,往往把宾语放在它的补足语后面.而用it做形式宾语,放在宾语补足语之前.
Eg.I think it no use arguing with him.