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1、Unit3 A healthy life-语法篇_1. 掌握it的用法；2. 理解并巩固it的各种用法并能正确使用；It的用法一、it 作人称代词1. it的最基本用法是作代词，主要指刚提到的事物，以避免重复:Xian isabeautifulcity, isntit?2. 也可以指动物或婴儿(未知性别的婴儿或孩子):Is this your dog? No, it isnt.二、it作非人称代词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，称为非人称的it：1. 指天气： It is a lovely day, isntit? It is a bit wi
2、ndy.2. 指时间：It was nearly midnight when she came back.3. 指环境：It was very quiet inthecaf. 4. 指距离： It is half an hourswalkto the city centre from my home.5. 指日期： -Whats the date today? -Its May 1, 2007.6. 指季节： It is summer now.7. 指度量： It is about 5 kilograms.8. 指价值： -Whats the cost of the T-shirt? -It
3、is 150 yuan.三、it用作形式主语替代作主语的从句、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。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, unnecessary, possible, impossible, likely, unlikely, right, wrong, important, unimportant, legal, illegal, polite, impolite, clear,
4、obvious, certain, suitable, proper, fit, useful, useless, dangerousIt is illegal（for a teenager）to drive a car without a license.(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, thoughtful, thoughtless, careful, careless, silly, foolish, stupid, cleve
5、r, wise, crazy.Its kind of you to help me with the problem.(3) It替代作主语的动名词的常见句型Its no good/use doingIts（well）worth doingIts（well）worthwhile doing/ to doIts no use crying over spilt milk.2. it作形式主语替代主语从句It+ be+ adj. +clause It is clear ( obvious, true, possible, certain ) that .该句型中it 是形式主语，真正的主语是tha
6、t 引导的主语从句，常译为“清楚（显然, 真的）” 是主语从句最常见的一种结构。例如：It is very clear that hes round and tall like a tree. It +be +v-ed +that=sb./sth.+be+ to do It is said (reported/ learned/believed/thought/known/told/hoped.) that . 该句型中的it 仍是形式主语，真正主语是that 引导的主语从句；该结构常译为“据说（据报道，据悉. . . ）”。It is reported that another earth
7、satellite has been put into orbit. It +be + noun +从句It is a pity /a shame + that . 该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去. 表示出乎意料，常译为“竟然”。没有这种意义时，则不用虚拟语气。It is a pity that such a thing (should) happen in your class. 这种事竟然发生在你们班上，真是遗憾！It is a pity that he is ill. 他生病了，真遗憾！四、it作形式宾语当复合宾语中的宾语是不定
8、式、动名词宾语从句时，往往把宾语放在它的补足语后面，而用it 作形式宾语，放在宾语补足语之前。该句型中的it 作形式宾语，常用的动词有think, believe, make, find, consider, feel等。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。五、用于强调
9、句型中It is/was + 被强调部分 + that/who . It is not until + 被强调部分 + that . It was five oclock _I got home.It was at five oclock_ I got home.强调句用以强调主语，宾语，介词宾语以及状语。强调人时用that和who whom皆可It was she who that had been wrong. It was the girl whom that I met just now. It was Tom to whom the teacher had talked. It wa
10、s on Monday night that all this happened. It is not until + 被强调部分 + that . 该句型也是强调句型。主要用于强凋时间状语，译成汉语 “直到才”，可以说是not . until . 的强调形式。例如: It was not until she took off her dark glasses that I realized she was a famous film star.= Not until she took off her dark glasses did I realize she was a famous fi
11、lm star.= I didnt realize she was a famous film star until she took off her dark glasses.六、It 常用的固定搭配1. make it（1）在口语当中相当于succeed，表示：成功、做到、说定、赶上、及时到达Its hard to make it to the top in show business.（2）在口语中相当于fix the date for，表示“约定好时间”例 Shall we meet next week？OK. We just make it next Saturday.2. take
12、 it/things easy 相当于Dont worry or dont hurry. 用来劝告别人，表示“不要慌，别担心，沉住气”Take it easy! He will do it well.3. It all depends/that all depends 在口语中，相当于it hasnt been decided yet，表示“那得看情况，还没有定下来”Are you going to the countryside for holiday?It/That all depends.4. Its up to sb. 在口语中，相当于its decided by sb. 表示“由决定
13、，由负责，取决于”Shall we go out for dinner?Its up to you.1. (2014南京一模)When_comes to an interview day, weve got many things in mind, such as being on time and giving proper answers.A. thatB. thisC. itD. one2. (2014山东济宁一模)He made_quite clear that he wouldnt change his mind.A. itB. thisC. himselfD. that3. (20
14、14湖南长沙一中、师大附中六校联考)His favorite food is fried snacks and soft drinks_is no surprise that losing weight is just his dream.A. ThereB. ItC. AsD. What4. (2014福建高中质检)Shall I attend my friends comingofage ceremony, Mum?No, unless you see to _that you will be home before 10:00 pm.A. one B. this C. it D. her5. (2014四川省南充市第一次适应性考试)You look very beautiful in this dress and there is only one of this kind left here.I wonder if you would buy_.A. oneB. itC. someD. any基础演练一、单项填空1. The fact that she was foreign made_difficult for her to get
