It最基本的用法
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This可以出现在它所指代的事物之前；而that则指上文所提到的 事物。
Listen to this! We will have three days off. “A penny saved is a penny earned.” Who said that?
3) It和one
It用以指特定的前面提到过的事物，即：it和它替换的是同一个 事物，it前无修饰语；而one用于替换与前提事物有共同之处 但并不完全一样的事物，因此，one之前或之后一定有修饰语 来加以区别。
也可以指动物或未知性别的婴儿。
What a beautiful baby， is it a boy?
How about the baby? ---- I’ll take care of it.
还可代表一个彼此都知其何所指的东西。
Where does it hurt?
If he doesn’t come, I can’t help it.
当前面提到的事物不止一件时， it通常指最先提到的事物，而 This/that是指最后提到的事物。
百度文库
We keep the ice cream machine in the spare room. It is mainly used by the children. (指 the machine) We keep the ice cream machine in the spare room. This/ That is mainly used by the children. (指the spare room)
killed in a car crash. 7）It +be+一段时间+ since…
It is/has been three week since I last heard from him. 8）It is time to do/ that…(谓语用过去时态）
It is time for us to give the house a thorough cleaning. It is time that we gave the house a thorough cleaning.
用于由that 引导的主语从句，有下面几种类型：
it +be+形容词+that从句： eg: It is natural that they should have different views. it +be+名词+that从句: eg: It’s a shame that you’re sick. it +动词（+宾语）+that从句 eg: It happened that she wasn’t in that day. Eg2: It never occurred to me that perhaps she was lying. It+动词的被动语态(said/believed/thought/expected/reported/ known+that从句 eg: It’s said that there has been an earthquake in India.
You have saved my life. I shall never forget it.
非人称代词it ：It 用于代替指示代词：
It 可以表示“是谁（在某处或做某事）
“Who’s that?” “It’s me.” It’s your mother on the phone. “Why, it’s you!” she cried.
2) it, this 和 that
都可以替代前文已提到的事或情况，细微差别在于it不如其余 两者那么强调。
So she decided to paint the door pink. It upset the neighbours a bit.
So she decided to paint the house pink. That really upset the neighbours, as you can imagine.
9）It + be + the first/second time that…(谓语动词用完成时态） It is the first time in history that two Nobel Prizes have been awarded to the same person.
10）It takes sb. Time to do… It took Mary 20 minutes to choose a suitable dress for the party.
4）it +动词的被动语态+从句 It is not decided who will edit it.
5）it +动词be +that从句 No, it couldn’t be that they were interested in him.
6）It +be + 一点时间+ when… It was Christmas Eve when I got the news of his being
That只用于替换表示事物的名词， 而one/ones替换表示人和表示 事物的名词皆可。
His younger sister is taller than the elder one. I need the plastic bags, not the paper ones.
That/ those一般用于替换有定冠词的名词；one/ones用于替换有 不定冠词的名词。
It 用于强调句
结构：It+动词be+强调部分+who(whom)/that+其他部分 it可以用来对句子的某一成分加以强调。
Nancy saw your sister in Tokyo last week. It was Nancy who saw your sister in Tokyo last week. It was your sister whom Nancy saw in Tokyo last week. It was in Tokyo that Nancy saw your sister last week. It was last week that Nancy saw your sister in Tokyo.
替代词one, ones, that, those, it, this, that 1) one, ones, that, those
That替换单数可数名词或不可数名词；one只替换单数的可数名词。 The vase on the left is more beautiful than the one on the right. The coffee produced in Brazil is more famous than that in Mexico.
有些否定句也可以改成这种强调结构： I didn’t hear from her until last summer. It wasn’t until last summer that I heard from her. I didn’t do all this for myself. It wasn’t for myself that I did all this. 问句也可变成这种结构： Who called him “comrade”? Who was it that called him “comrade”? How did you forget to lock the door? How was it that you forgot to lock the door?
I bought a dictionary three years ago and I am still using
it now.
I bought a dictionary three years ago but I am going to
buy a new one soon.
形式主语it：有下面几种类型：
be+形容词+不定式 eg: It’s better to be early. be+名词+不定式 eg: It was his duty to take care of the orphans. be+介词短语+不定式 eg: It’s beyond me to say why. It + 及物动词+宾语+不定式 eg: It makes me sick to think about it. be+名词+动名词 eg:It’s no good standing here in the cold. be + 形容词+动名词 eg:It’s helpless trying to convince her. 其他结构+动名词 eg:It doesn’t matter waiting a few more days.
That/ those一般不带前置定语，但必须有后置定语。One/ones 都可。当替换词的后置定语用所有格的of短语或当替换词被 所有格修饰时，不用one/ones而用that of/those of.
I like the vase better than the one / that in another shop. The windows of your flat are cleaner than those of mine. A grandparent’s job is easier than that of a parent.
2）it +be+名词+从句: It’s a puzzle how life began.
3）it +动词（+宾语）+从句 It doesn’t matter much where we live. It makes no difference whether we go by train or by boat.
形式宾语it:
it 可以代表不定式：
She found it difficult to convince him. He felt it his duty to take care of them.
It 代表that引导的从句：
I took it for granted (that) you would be coming.
It还可以用来泛指某件事
Isn’t it awful!
It doesn’t matter.
it 有时并不指具体东西，而指天气、时间、环境、距离等，
称为非人称代词it.
It’s raining.
It’s Tuesday today.
It’s quiet here.
It’s two miles to the beach.
The style of the building is similar to that of a temple. A CD player made in Japan costs more than one made in Hong Kong.
The computers in our school are connected to the Internet while those in their school aren’t. The football players on our team seem to be more energetic than those on your team.
It 最基本的用法是人称代词，主要代表刚提到的东西以避免重复。
Look at that car. It’s going much too fast.
Where is the car key? ---- I put it in your drawer.
也可以代表抽象的东西。
It’s all my fault .
It代表连接代（副）词引导的从句：
He hasn’t made it clear when he is coming back. They haven’t made it known where the meeting is to take place.
用it跟从句用法：
1）it +be+形容词+从句： It is not clear to me why he behaved like that.
Listen to this! We will have three days off. “A penny saved is a penny earned.” Who said that?
3) It和one
It用以指特定的前面提到过的事物，即：it和它替换的是同一个 事物，it前无修饰语；而one用于替换与前提事物有共同之处 但并不完全一样的事物，因此，one之前或之后一定有修饰语 来加以区别。
也可以指动物或未知性别的婴儿。
What a beautiful baby， is it a boy?
How about the baby? ---- I’ll take care of it.
还可代表一个彼此都知其何所指的东西。
Where does it hurt?
If he doesn’t come, I can’t help it.
当前面提到的事物不止一件时， it通常指最先提到的事物，而 This/that是指最后提到的事物。
百度文库
We keep the ice cream machine in the spare room. It is mainly used by the children. (指 the machine) We keep the ice cream machine in the spare room. This/ That is mainly used by the children. (指the spare room)
killed in a car crash. 7）It +be+一段时间+ since…
It is/has been three week since I last heard from him. 8）It is time to do/ that…(谓语用过去时态）
It is time for us to give the house a thorough cleaning. It is time that we gave the house a thorough cleaning.
用于由that 引导的主语从句，有下面几种类型：
it +be+形容词+that从句： eg: It is natural that they should have different views. it +be+名词+that从句: eg: It’s a shame that you’re sick. it +动词（+宾语）+that从句 eg: It happened that she wasn’t in that day. Eg2: It never occurred to me that perhaps she was lying. It+动词的被动语态(said/believed/thought/expected/reported/ known+that从句 eg: It’s said that there has been an earthquake in India.
You have saved my life. I shall never forget it.
非人称代词it ：It 用于代替指示代词：
It 可以表示“是谁（在某处或做某事）
“Who’s that?” “It’s me.” It’s your mother on the phone. “Why, it’s you!” she cried.
2) it, this 和 that
都可以替代前文已提到的事或情况，细微差别在于it不如其余 两者那么强调。
So she decided to paint the door pink. It upset the neighbours a bit.
So she decided to paint the house pink. That really upset the neighbours, as you can imagine.
9）It + be + the first/second time that…(谓语动词用完成时态） It is the first time in history that two Nobel Prizes have been awarded to the same person.
10）It takes sb. Time to do… It took Mary 20 minutes to choose a suitable dress for the party.
4）it +动词的被动语态+从句 It is not decided who will edit it.
5）it +动词be +that从句 No, it couldn’t be that they were interested in him.
6）It +be + 一点时间+ when… It was Christmas Eve when I got the news of his being
That只用于替换表示事物的名词， 而one/ones替换表示人和表示 事物的名词皆可。
His younger sister is taller than the elder one. I need the plastic bags, not the paper ones.
That/ those一般用于替换有定冠词的名词；one/ones用于替换有 不定冠词的名词。
It 用于强调句
结构：It+动词be+强调部分+who(whom)/that+其他部分 it可以用来对句子的某一成分加以强调。
Nancy saw your sister in Tokyo last week. It was Nancy who saw your sister in Tokyo last week. It was your sister whom Nancy saw in Tokyo last week. It was in Tokyo that Nancy saw your sister last week. It was last week that Nancy saw your sister in Tokyo.
替代词one, ones, that, those, it, this, that 1) one, ones, that, those
That替换单数可数名词或不可数名词；one只替换单数的可数名词。 The vase on the left is more beautiful than the one on the right. The coffee produced in Brazil is more famous than that in Mexico.
有些否定句也可以改成这种强调结构： I didn’t hear from her until last summer. It wasn’t until last summer that I heard from her. I didn’t do all this for myself. It wasn’t for myself that I did all this. 问句也可变成这种结构： Who called him “comrade”? Who was it that called him “comrade”? How did you forget to lock the door? How was it that you forgot to lock the door?
I bought a dictionary three years ago and I am still using
it now.
I bought a dictionary three years ago but I am going to
buy a new one soon.
形式主语it：有下面几种类型：
be+形容词+不定式 eg: It’s better to be early. be+名词+不定式 eg: It was his duty to take care of the orphans. be+介词短语+不定式 eg: It’s beyond me to say why. It + 及物动词+宾语+不定式 eg: It makes me sick to think about it. be+名词+动名词 eg:It’s no good standing here in the cold. be + 形容词+动名词 eg:It’s helpless trying to convince her. 其他结构+动名词 eg:It doesn’t matter waiting a few more days.
That/ those一般不带前置定语，但必须有后置定语。One/ones 都可。当替换词的后置定语用所有格的of短语或当替换词被 所有格修饰时，不用one/ones而用that of/those of.
I like the vase better than the one / that in another shop. The windows of your flat are cleaner than those of mine. A grandparent’s job is easier than that of a parent.
2）it +be+名词+从句: It’s a puzzle how life began.
3）it +动词（+宾语）+从句 It doesn’t matter much where we live. It makes no difference whether we go by train or by boat.
形式宾语it:
it 可以代表不定式：
She found it difficult to convince him. He felt it his duty to take care of them.
It 代表that引导的从句：
I took it for granted (that) you would be coming.
It还可以用来泛指某件事
Isn’t it awful!
It doesn’t matter.
it 有时并不指具体东西，而指天气、时间、环境、距离等，
称为非人称代词it.
It’s raining.
It’s Tuesday today.
It’s quiet here.
It’s two miles to the beach.
The style of the building is similar to that of a temple. A CD player made in Japan costs more than one made in Hong Kong.
The computers in our school are connected to the Internet while those in their school aren’t. The football players on our team seem to be more energetic than those on your team.
It 最基本的用法是人称代词，主要代表刚提到的东西以避免重复。
Look at that car. It’s going much too fast.
Where is the car key? ---- I put it in your drawer.
也可以代表抽象的东西。
It’s all my fault .
It代表连接代（副）词引导的从句：
He hasn’t made it clear when he is coming back. They haven’t made it known where the meeting is to take place.
用it跟从句用法：
1）it +be+形容词+从句： It is not clear to me why he behaved like that.