人教版英语选修六Unit 3 A healthy Life(Grammar：The use of ”it“)教学实用课件(共29张PPT)

2016/10/11
1 常用it作形式主语的句型：
1)用作形式主语， It be + adj. (clear, obvious, important, It that 从句用should+v 形容词是 natural, necessary necessary…)+ that从句 ,important, strange, essential， 2) It be + ed (said, reported, suggested …)+ 常用的过去分词有: required ,demanded, that从句 suggested (建议), ordered等 requested, 3) It be + 名词 (a shame, a pity)+ that从句
Back
It is necessary to keep the balance of nature. It is a waste of time persuading such a person join us. It is necessary that you (should) be ready by 5 o’clock. It was already known at that time that the earth is round. It is a surprise that he refused such a good It happened that he had to be present at the meeting.
强调句型
It is the ability to do the job__ matters not where you come from or what you are. A. one B. that C. what D. it It is/was + 强调部分 + that /who+ 其余部分
在一些固定用法中考查
常见的固定用法有: make it 成功，安排在或定在某时间 forget it 别提了，忘了它吧 Don’t mention it 别提了，表示不用谢 It doesn’t matter 没关系 It(That) depends 视情况而定 You guessed it 你猜着了 It’s hard to say 很难说 It’s up to you to do sth.由你来决定做某事 take it/things easy不要慌，别担心，沉住气
A. that B. which
4) It +不及物动词 (happens, appears, seems…)+ that从句
Back
I like ___C in the autumn when the weather is clear and bright. I’ll see to ——that we are all back safe.
1. This is a new dictionary. I bought it yesterday. 2. Jim is ill. Have you heard of it? 3. How is it going with you?
1. Someone is coming upstairs. It must be the postman. 2. What makes such noise? It must be the cat. 3. What a beautiful baby? Is it a boy?
it有时并不指具体的东西，而泛指天气、时间、日期、距离、价值、度量、温度、环境等
e.g. a. Jim is at the door．____wants to see C you． b．Someone is at the door．____must be Jim．
A. That, It B. It, He C. He, It D. Who, He 一般说来，在指代身份或性别明确的人时， 通常要根据情况用代词he／she；若是指代 身份或性别不明的人，则用代词it
it 作形式宾语，常用的动词有think, believe, make, find, consider, feel等
1. 代作主语的动词不定式
（1）It be adj.（for sb.）to do sth. 此处adj. 通常为描述事件的形容词：easy，difficult， hard，necessary，impossible，likely，，right， wrong，important，，polite，obvious，useful， useless，dangerous… It is illegal（for a teenager）to drive a car without a license.
做这件事情是。。。。Байду номын сангаас
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（2）It be adj. of sb. to do sth. 此处adj. 通常为描述人的形容词：kind， unkind，nice，rude，cruel，considerate， careless，silly，foolish，stupid，wise， crazy. It's kind of you to help me with the problem. 某人做某事某人是。。。
It is necessary to keep the balance of nature. It is a waste of time persuading such a person join us. It is necessary that you (should) be ready by 5 o’clock. It was already known at that time that the earth is round. It is a surprise that he refused such a good It happened that he had to be present at the meeting.
替代作主语的从句、动词不定式、动名词，而把真正作主语的 从句、动词不定式、动名词置于句尾。
I thought it impossible to finish the task in one day. I think it no use quarrelling with him. I think it his duty to clean the blackboard. I think it important that you lend him a hand. I felt it a pity that he couldn’t go along with them.
I thought it impossible to finish the task in one day. I think it no use quarrelling with him. I think it his duty to clean the blackboard. I think it important that you lend him a hand. I felt it a pity that he couldn’t go along with them.
1. Someone is coming upstairs. It must be the postman. 2. What makes such noise? It must be the cat. 3. What a beautiful baby? Is it a boy?
1. It is a lovely day, isn’t it? 2. It was nearly midnight when she came back. 3. It was noisy when he got to the classroom. 4. It is half an hour’s walk to the city centre.
it的最基本用法是作代词，主要指刚提到的一件东西， 也可表示刚提到的一件事情 也可指一个彼此都知道所指的东西
指代性别不详的人或者是幼儿，也可以指动物
1. It is a lovely day, isn’t it? 2. It was nearly midnight when she came back. 3. It was noisy when he got to the classroom. 4. It is half an hour’s walk to the city centre.
1. It was ___ back home after the experiment.
A. not until midnight did he go B. until midnight that he didn’t go
C. not until midnight that he went
D. until midnight when he didn’t go 2. In which play is ___ your brother appears? A. that where B. this when C. it that D. it where 3. It was in the lab ___ was taken charge of by Professor Zhang ___ they did the experiment. A. where; that B. which ; where C. that ; where D. which; that 4. It is the town ____ I was born.
2016/10/11
(3) It替代作主语的动名词的常见句型
It‘s no good/use/need/hopeless doing… It's（well）worth doing… It's（well）worthwhile doing/ to do It's no use crying over spilt milk.
2016/10/11
Group work
Please look at the following sentences and in your group discuss and summarize the use of “it”.
1. This is a new dictionary. I bought it yesterday. 2. Jim is ill. Have you heard of it? 3. How is it going with you?
A. this
B. that
C. it
D. one
某些动词如like, love, enjoy, Prefer , hate , appreciate后如果没有出现宾语而直接跟上了if， when引导的从句，要在从句前加it 在短语answer for负责, depend on依赖, insist on坚 持 ,see to负责，照顾 后接从句时用it，take it for granted 认为。。理所当然
Grammar: Use of “It”
康保一中 杨静慧
朗读与观察 It’s a beautiful day here and I am sitting under the big tree at the end of the garden. Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up. Believe me, I know how easy it is to begin. smoking and how tough it is to stop.