人教版英语选修六高二 unit3 语法 Grammar— it的用法(1)

Section_ⅢGrammar—it的用法(1) 语法图解

探究发现

①It is a beautiful day here and I am sitting under the big tree at the end of the garden.

②Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up.

③It is never too late to mend.

④It is no use talking to them.

⑤It is said that he stole the money.

⑥I think it difficult to learn English well.

⑦We make it clear that speaking to the teacher in that way is not polite.

⑧I don't like it when people talk with the mouth full of food.

[我的发现]

(1)①句it表示天气，②句第一个it代替to_give_it_up作形式宾语；第二个it代替句中所说的“吸烟”的事。

(2)在句③④⑤中it用作形式主语，其中句③用在“It is＋形容词＋(for/of＋sb.)＋动词不定式(短语)”中，it指代动词不定式(短语)；句④用在“It is＋no use/good＋动名词(短语)”中，it指代动名词(短语)；句⑤用在“It is＋said/believed/reported＋that从句”中，it指代that 从句。

(3)在句⑥⑦⑧中it用作形式宾语，其中句⑥用在“动词＋it＋形容词＋动词不定式(短语)”中，it指代动词不定式(短语)，句⑦用在“动词＋it＋形容词＋that从句”中，指代that 从句；句⑧it用在某些特殊的句式中，指代when从句。

一、it用作人称代词和非人称代词

1．用作人称代词

(1)it用来指代前面的名词或前面提到过的事。

My friend offered me a beautiful gift yesterday, and I like it very much.

我朋友昨天给了我一件漂亮的礼物，我非常喜欢。

(2)指代性别不明的child或baby。

His sister has given a birth to a baby recently and it is very beautiful.

他姐姐最近生了个孩子，很漂亮。

(3)指代未出场的身份不明确的人。

—Who is waiting for you at the bus stop?

—I have no idea.It may be my brother.

——谁在车站等着你？

——不知道，可能是我哥哥。

(4)替代前文中的this, that。

This is your plan? Will you hand it in?

这是你的计划？你要交上去吗？

2．用作非人称代词

it用作无人称的主语，不指物，而表示时间、天气、气候、季节、距离等自然现象，或指事物的状态。

It is a fine day today, isn't it?

今天是个好天气，对吧？

It is five kilometers to the town from the village.

从农村到城镇有10里路。

It's ten o'clock.

十点钟了。

[即时演练1]匹配下面it的用法

A．指代前面的名词

B．指代性别不明的child或baby

C．指代未出场的身份不明确的人

D．时间

E．距离

①—Who's that at the door?

—It is the milkman. __C__

②Qingdao is a beautiful city, isn't it?__A__

③The baby is crying. It might be hungry. __B__

④What a long way it is from Beijing to London! __E__

⑤It was nearly midnight when she came back. __D__

二、it用作形式主语

it常代替由不定式、动词的-ing形式或从句表示的真正主语，作形式主语，而将真正的主语移至句子的后面。

1．代替不定式短语作形式主语

It is impossible to get there by boat.

坐船不可能到那里。

It's very kind of you to help me.

你帮助我真好。

2．代替动名词短语作形式主语

常用于以下结构中：

It's no use/no good/no fun/useless/a waste of time doing sth.

做某事没有用/没有好处/没有意思/没有用/浪费时间。

It is no use giving him some advice.

＝It is useless giving him some advice.

给他提建议没用。

3．代替主语从句作形式主语

It is necessary that the work should be done well.

这项工作应该被完美完成是必须的。

It's a pity that I didn't think of it earlier.

我没有早一点这么想真是遗憾。

4．注意以下固定句型

It seems(ed)/appears(ed) that ...似乎……

It (so) happened that ... 碰巧……

It turns(ed) out that ... 结果是……

It occurred to sb. that ... 某人突然想起……

It is said/reported/believed/hoped/well-known/suggested ... that ...

据说/据报道/大家都相信/人人都希望/大家都知道/有人建议……

It so happened that the tickets were sold out.

碰巧票都卖光了。

It occurred to her that she might adopt a homeless child.

她突然想到她可以收养一个无家可归的孩子。

It turns out that the situation is quite serious.

结果表明情况很严峻。

[即时演练2]补全句子

①(2015·四川高考满分作文)I badly need to improve my oral English, so it_is_great

_for_me_to_find a native speaker to learn from.

我急需提高我的英语口语，因此对我来说找到一个可以向他学习的当地人真是太好了。