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1、 It的用法（1）主语1. Whos that? _Professor Li. A. Thats B. ItsC. Hes D. Thiss2. The color of my coat is different from _ of yours. A. this B. that C. it D. one3._ will do you good to do some exercise every morning. A. It B. There C. Those D. You1. 指代时间、天气、距离、日期、重量、价值及价格、环境情况等。What day is today? It is Sunda
2、y. It was nearly midnight when I arrived home. It is cooler today than it was yesterday. Its about an hours walk from here to the village. It costs ten dollars. It is very noisy at the moment. 2. 指代this, that。Whats this in English? Its a computer. 3. 指代无生命物或性别不明、身份不明的人。What a lovely baby, isnt it? S
3、omeone is knocking at the door, who can it be? 4. 指代上文，即事件。I told him to read a lot, but it didnt help. 5. 作形式主语，代替不定式、动名词、从句。It is necessary to keep the balance of nature. It is well known that Taiwan belongs to China. It is illegal(for a teenager)to drive a car without a licence. Before a problem
4、can be solved, it must be obvious _ the problem itself is. 2011湖南, 31A. what B. that C. which D. why 【解析】选选A。考查查名词词性从句。句意：在解决问题问题 之前必须须弄清楚问题问题 本身是什么。what引导导主语语从句，并在主语语从句中充当表语语。注：句中的it是形式主语语。It was never clear _ the man hadnt reported the accident sooner. 2011江苏苏, 26A. that B. how C. when D. why【解析】选
5、选D。考查查主语语从句。句意：这这个人为为什么没有尽快报报告这这个事故，还还不清楚。根据句意可知主语语从句中缺少原因状语语，故用why。that引导导主语语从句不作句子成分；how引导导方式状语语从句；when引导时间导时间 状语语从句。It is still under discussion _ the old bus station should be replaced with a modern hotel or not. 2011重庆庆, 22A. whether B. when C. which D. where【解析】选选 A。考查查名词词性从句。句意：旧汽车车站是否应应该该被改建
6、为现为现 代化的宾馆宾馆 仍然在商讨讨中。引导导名词词性从句时时，A项项意为为“是否”，并且能与or not连连用；B项项意为为“的时间时间 ”；C项项意为为“哪一个，哪一些”；D项项意为为“的地点”。此句中，it为为形式主语语，后面为为真正的主语语从句，由句意以及后面的or not可知选选A。 6. 常用it作形式主语的一些固定句型。（1）It+be+形容词或“a(n)+名词”+to do sth. 。用于这一结构的名词常见的有a pleasure, a pity, a fact, a shame, an honor, a wonder, a good thing及 good news等。I
7、t is not easy to learn English well. = To learn English well is not easy. 学好英语不容易。（2）Itbe形容词for sb. to do sth. 。在这一句式中，形容词通常是表示事物的性质或特征的形容词，常见的有difficult, hard, easy, heavy, dangerous, expensive, useful, important, possible及necessary等。It is impossible for her to buy the car with cash. 要她用现金买那辆汽车是不可能
8、的。 （3）Itbe形容词of sb. to do sth. 。在这一句式中，形容词通常是表示人的行为或品德的形容词，常见的有honest, wise, clever, brave, foolish, kind, good, careful, stupid, silly, nice, right, wrong, polite及rude等。It was careless of him to leave the door unlocked. 他没有把门锁上就离开了，实在是太粗心了。 （4）Itbeno+不可数名词doing sth. 。这一结构中的名词最常用的是wonder, use及good等。
9、It is no use talking to him about it. 跟他谈那件事没用。（5）Itbe形容词doing sth. 。It is dangerous playing with fire. 玩火是危险的。 （6）It+be+形容词+that从句或wh-从句。It is certain that the earth is round. 毫无疑问，地球是圆的。（7）Itbe及物动词的过去分词that从句。用于这一结构的过去分词常见的有said, told, known, considered, hoped, recorded, suggested, thought及reporte
10、d等。It is reported that many people have seen UFOs. 据报道很多人看到了不明飞行物。 (8)It+costs/takes/+(sb. )+money/time to do sth. 。It takes us thirty minutes to walk from here to the station.我们从这里步行到车站要30分钟。(9)It is/was+被强调部分+that. . .It was yesterday that I met Lucy in the street. 就是昨天我在街上遇见露西的。 7. it与one和that的区别
11、(1)it与one的区别两个词都可代指前面提到的名词，但it用于同名同物的场合；one则用于同名异物的场合, 表泛指，相当于“a(n)+名词”。Is this knife yours? No. Its Xiao Zhangs. Mine is the one on the desk. (2)it与that的区别两词都可代替某一特定名词。但that指同一类，并非同一个。The climate of South China is better than that of Japan. (that指the climate, 但并不是指the climate of South China)The cos
12、t of renting a house in central Xian is higher than _ in any other area of the city. 2010陕陕西，12A. that B. this C. it D. one 【解析】选选A。考查查代词词的用法。句意：在西安市中区租房的费费用比在这这个城市的其他任何地区都要高。that指代同名异物不可数名词词或单单数可数名词词，表示特指意义义。this不作替代词词用；it指代上文出现现的同一事物；one指代同名异物单单数可数名词词，表示泛指意义义。It的用法（2）“it”用于强调调句型1. _ was Jane that
13、I saw in the library this morning. A. It B. He C. She D. That2. It was through Xiao Li _ I got to know Xiao Wang. A. who B. whom C. how D. that3. It was in the rice fields _ we had our league meeting. A. where B. that C. in which D. on which4. It was on October 1st _ new China was founded. A. which
14、B. when C. as D. that5. Was it because he was ill _ he asked for leave? A. and B. that C. thats D. so6. It was _ I met Mr Green in Shanghai. A. many years that B. many years beforeC. many years ago that D. many years when强调是一种修饰，是人们为了表达自己的意愿或情感而使用的一种形式。一、强调句型的构成形式It is /was+被强调部分+that/who. . . 句型。此句
15、型中，it本身没有词义。利用还原法去掉It is/was. . . that/who后经整理句子结构仍然完整，句意仍明确，这就是强调句型。反之，则不是强调句型，试比较：It was in the evening that we got to the small village. 是在晚上的时候，我们到达了那个小村庄。It was evening when we got to the small village. 当我们到达小村庄的时候，已经是晚上了。第一句是强调句，强调的是时间状语in the evening, 可以还原成：We got to the small village in the evening; 而第二句不是强调句，
