it. 用法公开课ppt

引导词 it
1、It was so comfortable to walk on the street. 真正主语 形式主语 = To walk on the street was so comfortable. = Smoking is no good. 2、It is no good smoking. 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
（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.
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。
时间 It’s time for class. 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 代替if引导的宾语 从句。
1、用it句型改写句子，意思不变。
1. Giving up smoking is difficult. It is difficult to give up smoking. 2. Some young people think they look attractive when they smoke. It seems that some young people think they look attractive when they smoke. 3. Most people believe smoking causes cancer. It is believed that smoking causes cancer 4.Don’t try to quit on a stressful day. It is no use trying to quit on a stressful day.
It is important for a teenager to learn English well.. = to learn English well is important to for a teenager
（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. = You are kind to help me with the problem.
引导词 --- it
作形式宾语，代替由不定式、动名词或从 句表示的真正宾语。 He feels it his duty to help others. We thought it no use doing that. He made it clear that he was not interested in this subject. 他非常清楚地表示他对那门学科不感兴趣。
5．A.Who will take us to visit the nature park hasn't been decided yet. B.__ _____ ____ _______ ___ who will take us to It hasn't been decided yet visit the nature park. 6．A.He gets up early and runs around the playground for half an hour every day.He has made that a rule. B.He has made __ ___ ___ ___ ___early ______ and it __ a rule to get up run around the playground for half an hour every day.
环境
the use of it
天气
距离
It was a sunny day. Peter decided to go for a walk to the park even though it was 2 miles away. He was just about to leave the 未知的人 house when someone knocked at the door. “Who is it?”,he thought. When he opened 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 形式主语
(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
2、用it句型把A句转换为B句，意思不变。 1. A.To keep order in an important football match is a hard job for the police. It __ is ___ a _____ hard ____ job for the police to keep order B．__ in an important football match. 2．A.To recite the passages in New Concept English is an effective way in English study. B. __ It __ is ___ an ________ effective _____ way in English study to recite the passages in New Concept English. 3. A.I meant that you might go without me, but I didn't make that clear. make __ it _____ clear that you might go without me. B.I didn't _____ 4．A. Memorizing 20 English words a day is easy for me. it ____ easy __ to memorize B.I find __ __________20 English words a day.
注意：常用的动词有think, believe, make, find,
consider, feel等。
在动词appreciate, dislike,hate，like, love等 后面代替if或when等引导的从句。 I would appreciate it if you can come.
= 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。
（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 very quiet in our classroom every night. ---What's the date today? 日期 ---It's May 15, 2013. ---What's the cost of the T-shirt? ---It is 150 yuan. 价值
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. As you know, if you do the same thing over and over again, you begin to do it automatically. the thing 2. 用以代替指示代词this, that。 --- Whose text-book is that? --- 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.
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. It is reported that Chairman Xi will visit Hangzhou. (4) It happens/ seems/appears+ that 从句 It seems that there is no way out of our difficulty.
5. China produces one third of the world’s cigarettes. It is astonishing that China produces one third of the world’s cigarettes. 6. You are not allowed to advertise cigarettes in this country. It is illegal to advertise cigarettes in this country. 7. My father has quit smoking at last. It is wonderful that my father has quit smoking at last. 8. The night was dark and stormy when the old man started his journey. It was a dark and stormy night when the old man ... 9.You could suffer from bad health if you keep smoking. It is likely that you could suffer from bad healthlls to control your blood pressure. It is necessary for you to take pills to control your ...