It 用法 课件高考英语一轮复习.pptx

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1、The use of “it”,it用作人称代词,I cant find my pen. It was on my desk a minute ago.Look at that bird. It always comes to my window.You mustnt play on the road. It is dangerous.,指代无生命的东西,指动物和植物,代替上文中提到的整个事情,The baby next door kept me awake. It cried all night.Who is knocking at the door? It is me.,指代婴儿,指代说话

2、者不太清楚的那个人，常在打电话或敲门时,it用作非人称代词,It was raining this morning.It is two miles to the beach.It is half past seven now. It is cold/quiet here.,表示天气,表示距离,表示时间,表示环境,Its time for sth. 该做某事了。Its time (for sb.) to do sth. 该做某事的时候了。Its (about / high) time + that-从句。 该做某事了。(从句谓语用过去式，或“should+动词原形”)Its ones/ the

3、first (second) time + that-从句. 某人第几次干某事。(从句谓语用现在完成时)It will be + 时间段 + before-从句。 过多长的时间才,it用作形式主语,Its important for us to protect the environment.Its kind of you to help me.It is/was + adj. + (for sb.) + to do sth.It is/was + adj. + (of sb.) + to do sth.形容词用来形容人的时候，介词用of；形容不定式则用for。,It is/was + n.+

4、 to do sth.turn, duty, pleasure, a pity, great fun, a habit, a rule, a shame, no wonder, etc.Its your turn to be on duty today.It is/was +adj. + that从句certain, important, necessary, clear, pain, true, sure, obvious, etc.It is certain that he will attend the meeting.,It is/was + adj./n. + v-ingIts no

5、 use doing sth. 做某事没用It is no good doing sth. 做某事没好处It is worth doing sth. 做某事是值得的It is + p.p +that从句reported, suggested, said, hoped, thought, known, announced, believed, supposed, etc.,It takes (sb.) some time to do sth.It costs sb. some money to do sth.,it用作形式宾语,it作形式宾语，真正的宾语为不定式短语、v-ing或名词性从句。+v

6、erb+it+adj./ n.+ infinite/clause/v-ingthink, make, find, consider, feel, take, etc.,I think it no use arguing with him.我认为和他争吵没有用。I found it very interesting to study English.我发现学英语非常有趣。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。,Rewrite the sentences using an “it

7、” structure.,Giving up smoking is difficult. 2. Some young people think they look attractive when they smoke.,It is difficult to give up smoking.,It seems that some young people think they look attractive when they smoke.,Exercise,3. Most people believe smoking causes cancer.4. Dont try to quit on a

8、 stressful day. 5. China produces one third of the worlds cigarettes.,It is believed that smoking causes cancer.,It is no use trying to quit on a stressful day.,It is astonishing that China produces one-third of the worlds cigarettes.,You are not allowed to advertise cigarettes in this country.My fa

9、ther ahs quit smoking at last.The night was dark and stormy when the old man started his journey.,It is illegal to advertise cigarettes in this country.,It is wonderful that my father has quit smoking at last.,It was a dark and stormy night when the old man started his journey.,9. You could suffer from bad health if you keep smoking. 10. You have to take pills to control your blood pressure.,It is likely that you could suffer from bad health if you keep smoking.,It is necessary for you to take pills to control your blood pressure.,it在强调句中,