高考语法unit3it用法公开.ppt

Unit3 A healthy life,石家庄学院元氏分院 魏会佳,What is it?,Play a game,One Student reads the clues to the habits and the other one guesses the answer.,. careful person.,It is a bad habit for males and females. You can become addicted to it. Some people think you are grownup if you do this. It makes you smell bad, and turn your teeth yellow.,What is it?,. careful person.,It is a bad habit for both males and females. It is something you shouldnt start because you will be addicted to it. It is something which is illegal. It is a very expensive habit and so will waste your money.,What is it?,drug taking,. careful person.,It is a disease you can catch if you have unprotected sex. This illness stay in your body for a long time and eventually weakens your immune system. There is no cure at the moment for this illness.,What is it?,AIDS,. careful person.,It is a bad habit for males and females. It begins as a social activity at mealtimes. It only becomes a problem when a person has too much too often. It can become addictive and cause great harm to the body.,What is it?,Drinking alcohol,. careful person.,It is a bad habit It begins as It only becomes It is a disease It is something. It makes you smell bad,. careful person.,The use of “It“,-What do you think of the movie? -Its one of the best movies that Ive seen.,Whos the lovely baby?,My mother is Miss Wei.,Its my baby.,It can be used as personal pronouns （人称代词）, referring to the person, animal or matter mentioned above, or the person who you are not sure of gender.,summary1,a page from Peters dairy,_ was a sunny day. Peter decided to go for a walk to the park, though _ was two miles away. _ was so comfortable to walk on the street.,it,it,It,Suddenly _began to rain. He found _ hard to walk there. Then he took a bus home. Unfortunately _ went wrong. When he got home, he was wet through. Thus _ was a day that he would never forget.,It,it,it,it,Eg: It was a sunny day. Peter decided to go for a walk to the park, though it was two miles away.,Summary 2,It can be used as impersonal pronouns （非人称代词）to talk about time, date, distance or weather and so on.,Reading,Advice from Grandad,A healthy life,It is not easy to stop smoking. It seems amazing that at my age I am still fit enough to cycle 20 kilometres in an aftermoon. 3. You are founding it difficult to give it up.,Summary 3,“It” can be used in the subject or object position to stand for the infinitive（不定式）or a clause.,Rewrite these sentences using an “it” structure.,1.Giving up smoking is difficult. It is 2.Some young people think they look attractive when they smoke. It seems 3.Most people believe smoking causes cancer. It is believed,difficult to give up smoking.,that some young people think they look attractive when they smoke.,that smoking causes cancer.,4.You are not allowed to advertise cigrettes in this country. It is illegal 5.You could suffer from bad health if you keep smoking. It is likely 6.You have to take pills to control your bloody pressure. It is necessary,to advertise cigrettes in this country.,that you could suffer from bad health if you keep smoking.,for you to take pills to control your bloody pressure.,Preparatory subject（形式主语）,adj.,difficult/ easy Important,n.,pleasure/ pity/ shame/ fun,v.,It is/was,It is/was a,It,appears seems looks certain is said,that,to do,that,to do,that,Preparatory object（形式宾语）,v.,Sb.+,think make it find,+ adj.,to do + that,Join the two sentences by using “it” as object.,Jane thinks it funny that I have taken up Chinese kungfu.,I have taken up Chinese kungfu. Jane thinks it is funny.,Role-play a dialogue.,One of you is an eye witness (E) who has seen a robbery（抢劫） or an accident.The other is the Policeman /policewoman(P) who wants as much information as possible. Use “it ”in the answers.,For example:,P: What was the weather like on the day of the accident ? E: It was beginning to rain hard and the ground was slippery（滑的）. P: How far could you see? E: It was impossble to see more than twenty yards ahead of you, so all the cars were travelling very slowly. P: What about Mr Lis car? Was it travelling slowly too? ,Sum Up,It can be used as personal pronouns （人称代词）,It can be used as impersonal pronouns （非人称代词）,It can be used in the subject or object position to stand for the infinitiv（不定式）or a clause.,Review the use of it by doing the exercise on P57.,Homework,If you want knowledge, you must toil for it. 要想求知，就得吃苦。,Summary 4,Summary 4,Eg:,It was we who/ that called on Professor Wang at his