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1、,it的用法,一、用来表示时间、天气、地点、距离、环境、形势、还可指未知的人等。例如： It is two miles to the beach. It was raining in the morning. If its convenient, I can see you tomorrow. It was very noisy at the very moment. Someone is knocking at the door. Go and see who it is .,it表示时间常用于句型： 1、 It is/has been一段时间since 从句（用一般过去时态） It was
2、 一段时间 since 从句 （用过去完成时态） 用meet 的适当形式填空 例如： 1）It is/has been many years since I you last in London. 2）It was a long time since I you last in London.,met,had met,It is five months since I arrived in New York. 我到纽约已经五个月了。 It is five months since I was in New York.我离开纽约已经五个月了。 （注意：终止性动词表示从动作发生时算起；如果是状态动
3、词或持续性动词，则从动作或状态结束时算起。）,2、 It is/ will be + 一段时间 + before 从句(用现在时态) It was +一段时间+before从句 （用一般过去时态） 表示“在（做某事）前过了多长时间”，或“过了多长时间才”。如： But it _more than 100 years before the country begins once again to look as it did before.,will be,二、用作人称代词，代替前文提到过的事物 如： The train has arrived. It arrived half an hour
4、ago. 注：区分 it one that 1. I was disappointed with the film ，I had expected _ to be much better Athat Bthis Cone Dit,2. I prefer a flat in Inverness to _ in Perth, because I want to live near my Moms. A. one B. that C. it D. this 3.The air of a suburb is cleaner than _of a city. A. one B. that C. it D
5、. those,三、指代不定式、动名词、从句等，用作形式主语或形式宾语。如： It is not easy to finish the work in two days. It is no use crying over spilt milk. It is a pity that you didnt read the book. I think it no use arguing with him. I found it very interesting to study English. He made it clear that he was not interested in that
6、subject.,注意： it 用在不能直接跟宾语从句的动词，尤其是表示好、恶的动词，如： enjoy, like, hate, cant help, appreciate, see to(注意到，务必) 1.I will appreciate it if you help me. 2.please see to it that you bring enough money when you go out.,1. We must make _ to the public that something should be done to stop pollution. What is clear
7、 B. it is clear C. it clear D. that clear 2. I hate _ when people talk with their mouths full. A. it B. that C. these D. them,3. _ one day they will have enough animals to set them free. It is hoped for B. what is hoped that C. As is hoped that D. It is hoped that,四、it 用来引起强调句型 It is/was + 被强调的部分 +t
8、hat/who Is/Was it + 被强调的部分 +that/who? 特殊疑问词+is/was it that/who? I didnt meet her in the street until May. It was in the street that I didnt meet her until May. It was not until May that I met her in the street.,比较： It is in a small factory that my brother is going to work.(强调句型) It is a small factor
9、y where my brother is going to work.（定语从句） 1. It was in the school, _ I once studied, _we held a party. A. when/that B. in which/ that C. that/where D. that/in which,2. It was five oclock in the afternoon _ they climbed up to the top of the mountain Asince Bwhen Cthat Duntil 3.-_you got to know I tr
10、aveled to the USA? -Through one of your colleagues. A. Where it was that B. When it was that C. How was it that D. Why was it that,综合练习 1.As the busiest woman in Norton, she made _ her duty to look after all the other peoples affairs in that town. A. this B. that C. one D. it 2. _ is our belief that
11、 improvements in health care will lead to a stronger, more prosperous economy. (2006 浙江) A. What B. That C. This D. It,3. Id appreciate _ if you would like to teach me how to use the computer. A. that B. it C. this D. you (2006 山东) 4. I dont like working late into the night, but I cant help _. A. so
12、 B. that C. it D. them.,5. The doctor advised strongly that she should take a holiday, but _ didnt help. A. it B. she C. which D. he 6. Cars do cause us some health problems in fact far more serious _ than mobile phones do. A. one B. ones C. it D. those,7. -He was nearly drown once. -When was _ -_ w
13、as in 1998 when he was in middle school. A. that; It B. this; This C. this; It D. that; This 8. Meeting my uncle after all these years was an unforgettable moment, _ I will always treasure. A. that B. one C. it D. what (2002 全国),含有“It is ”的句型 It is time (for sb.) to do sth. It is (high) time that sb
14、. did/should do sth. 2. It is + 形容词（+of / for sb.）+ to do sth. 通常用 of的词有brave、clever、careful、 hopeless、kind、good、naughty、nice、 silly、stupid、foolish、wise等。,3. It is + 形容词 + that + sb. + (should) do sth.（虚拟语气） 能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、neces
15、sary、useless、likely、probable、impossible等。有时可省去should而直接用动词原形。 It is important that we should pay close attention to grain. It is natural that he（should）say so.,4. It is no use/ good + doing sth. It is no use trying again = It is of no use to try again. 5. It is said/reported/announced/ (well) known /believed that It is believed that proper morning exercises are good for our health.,6. It is /was/will be the first/second/third time that It is the first time that I have been here. It was the second time
