it的用法
图片预览
文档简介
课件12张PPT。It的用法1.用于指事物。代替前面已提到过的事物，以避免重复。I cannot find my watch；I must have lost it.2.用于指动物或婴儿。主要用于指动物或性别不详的婴儿。①“Where is the cat?’’ “ It is under the bed.”②They got a baby and it’s very lovely.3.用于上文提到的情况。He smokes a lot in bed and I don’t like it.用作人称代词4.用于指人。主要用于确定未知人的身份：①“Who is it？” “It’s me.”②Someone must have been here, but we
have no idea who it was.5.指物时与One的区别。”。比较：
⑴I have a pen but I’ve lent it to Mary .
⑵I haven’t a pen ; can you lend me one ? 1.用于指时间
It’s three years since he left here .
2.用于指距离
How far is it from here to the station?
3.用于指环境
It was very quiet in the garden .
4.用于指天气等自然现象
It’s very cold today .
5.用于笼统地谈论某情况
I cannot help it . 没办法了。
“How’s it going？”“well，not so good.” 用作虚主语或虚宾语
1. 基本用法。当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式 主语it，而把真正的主语放在句子末尾：
⑴Is it necessary to do so？
⑵It doesn’t matter what she says.2几种特殊的形式主语
⑴.用作动词look 、seem 、appear 、happen 、occur 、follow 等的主语（后接that从句或as if从句）：
用作形式主语
①It seems as if it is going to rain.
②It（so）happened that I had no money with me.⑵当系表结构接有或引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法：
①It was a good surprise to me when he said that .
②It would be a tragedy if anything went wrong.⑶用于其他固定句型,如if it were not for…,
it’s time that…3误用形式主语的几种情况:
⑴在该用it作形式主语的地方而误用其他词
Is ____ necessary to tell his father
everything?
A.it B.that C. what D.he
⑵在不该用it作形式主语的地方而误用形式主语
____must be something wrong with the
machine.
A.There B.It C.He D.That AA①___is known to all, the earth runs around the earth .
②__is known to all that the earth runs around the earth .
A.It B.which C.As D.That
③__is difficult to persuade her to stay.
④__is difficult is to persuade her to stay.
A.It B.what C.He D.ThatC试比较：AAB1.基本用法：当不定式、动名词 、从句等用作宾语且其后跟有宾补时,常在宾补前使用形式宾语,而将真正的宾语移到句末:
① We found it difficult to persuade her.
② He make it a rule to get up before dawn.
2.几种特殊的形式宾语：
通常意义的形式宾语主要用作形式宾语用于“动词＋it＋宾语补足语＋真正宾语”这样的结构，但以下几类形式宾语比教特殊，其后没有宾补：⑴由于介词后通常不能直接跟从句作宾语，有个别特殊结构就在介词后先接it作形式宾语，再跟that从句：
① You may depend on it that he will turn up in time .
②I’ll see to it that all these letters will be sent to the post office before twelve.个别介词（主要是but和 except）也可接that从句作宾语：
I know nothing about him except that he lives next door.
⑵有的动词由于通常只用作及物动词，当它们后接if从句或when从句，通常应先在动词后接it作形式宾语。
①She won’t like it if you arrive late.
②He hates it when people use his bike.
能这样用的动词不多，主要有enjoy，like，dislike，love，hate，prefer，appreciate等表示情绪的动词。
I hate_____when people talk with their mouths full.
A. it B. that C .these D. themA⑶用于have it that（说、认为）,take it that（认为）等固定表达中:
①I take it that you agree.
②Report has it that about 30 people were killed in the accident.
It用于强调句型中(省略)用于强调句型中
have no idea who it was.5.指物时与One的区别。”。比较：
⑴I have a pen but I’ve lent it to Mary .
⑵I haven’t a pen ; can you lend me one ? 1.用于指时间
It’s three years since he left here .
2.用于指距离
How far is it from here to the station?
3.用于指环境
It was very quiet in the garden .
4.用于指天气等自然现象
It’s very cold today .
5.用于笼统地谈论某情况
I cannot help it . 没办法了。
“How’s it going？”“well，not so good.” 用作虚主语或虚宾语
1. 基本用法。当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式 主语it，而把真正的主语放在句子末尾：
⑴Is it necessary to do so？
⑵It doesn’t matter what she says.2几种特殊的形式主语
⑴.用作动词look 、seem 、appear 、happen 、occur 、follow 等的主语（后接that从句或as if从句）：
用作形式主语
①It seems as if it is going to rain.
②It（so）happened that I had no money with me.⑵当系表结构接有或引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法：
①It was a good surprise to me when he said that .
②It would be a tragedy if anything went wrong.⑶用于其他固定句型,如if it were not for…,
it’s time that…3误用形式主语的几种情况:
⑴在该用it作形式主语的地方而误用其他词
Is ____ necessary to tell his father
everything?
A.it B.that C. what D.he
⑵在不该用it作形式主语的地方而误用形式主语
____must be something wrong with the
machine.
A.There B.It C.He D.That AA①___is known to all, the earth runs around the earth .
②__is known to all that the earth runs around the earth .
A.It B.which C.As D.That
③__is difficult to persuade her to stay.
④__is difficult is to persuade her to stay.
A.It B.what C.He D.ThatC试比较：AAB1.基本用法：当不定式、动名词 、从句等用作宾语且其后跟有宾补时,常在宾补前使用形式宾语,而将真正的宾语移到句末:
① We found it difficult to persuade her.
② He make it a rule to get up before dawn.
2.几种特殊的形式宾语：
通常意义的形式宾语主要用作形式宾语用于“动词＋it＋宾语补足语＋真正宾语”这样的结构，但以下几类形式宾语比教特殊，其后没有宾补：⑴由于介词后通常不能直接跟从句作宾语，有个别特殊结构就在介词后先接it作形式宾语，再跟that从句：
① You may depend on it that he will turn up in time .
②I’ll see to it that all these letters will be sent to the post office before twelve.个别介词（主要是but和 except）也可接that从句作宾语：
I know nothing about him except that he lives next door.
⑵有的动词由于通常只用作及物动词，当它们后接if从句或when从句，通常应先在动词后接it作形式宾语。
①She won’t like it if you arrive late.
②He hates it when people use his bike.
能这样用的动词不多，主要有enjoy，like，dislike，love，hate，prefer，appreciate等表示情绪的动词。
I hate_____when people talk with their mouths full.
A. it B. that C .these D. themA⑶用于have it that（说、认为）,take it that（认为）等固定表达中:
①I take it that you agree.
②Report has it that about 30 people were killed in the accident.
It用于强调句型中(省略)用于强调句型中