it用法PPT课件

1、It is never too old to learn. 活到老, 学到老。 It is no use crying over spilt (溢出的) milk. 覆水难收。It takes three generations (代) to make a gentleman. 十年树木, 百年树人。 Proverbs(谚语) with “It”第1页/共31页The use of “it”一、 用作人称代词, 代表前面提到的人或事物 Whos it? _ me. Look at the picture. _ is a picture of our school.ItsIt二、用于代替指示代词

2、this 和that。-Is this jacket yours?-Yes, _ is.it第2页/共31页三、用以表示时间、距离、天气、气候、 季节、环境等 It is half past eight now. Its only half an hours walk from here to our school. 3) I hope that it will be fine tomorrow. 4) It has rained much this year. 5) Its spring now. 6) Its quiet here.TimeDistanceWeatherWeatherSea

3、sonCircumstance第3页/共31页替代作主语的从句、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。四、it 用作形式主语第4页/共31页1. 代替动词不定式做主语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, necessary, important, possible, dangerous, right, wrong, legal, useful, useless, It is illegal to drive a car without a license.第

4、5页/共31页2) It be adj. of sb. to do sth.此处adj. 通常为描述人的形容词: kind , nice, rude, polite, cruel, considerate, thoughtful, careful, careless,foolish, stupid, clever, wise, crazy.Its kind of you to help me with the problem.第6页/共31页Its (well) worth ones while doing/to doIt is worth my while to explore the ci

5、ty.这值得我花时间/精力勘察这个城市Its (well) worthwhile doing/ to doIt is worthwhile to explore the city.Its no good/ use/pleasure doing It is no use studying only at school.2. 代替动名词做主语第7页/共31页3. 代替主语从句作形式主语It is clear ( obvious, true, possible, certain ) that .（注意没有it is sure that）该句型中it 是形式主语, 真正的主语是that 引导的主语从句

6、, 常译为“清楚(显然, 真的)”, 是主语从句最常见的一种结构。e.g. It is very clear that he is tall.It is adj. + 从句第8页/共31页It is said (reported/believed.) 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 said that he has come to Beijing.He is said to have come to Beijing.It is v-ed that 第9页/共31页 It is + noun

7、+ 从句 It is a pity (a shame /an honor /a good thing/a fact /a surprise/. ) 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。如：第10页/共31页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 you cant come. 你不能来，真是遗憾！第11

8、页/共31页五、it作形式宾语 当复合宾语中的宾语是不定式、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。 第12页/共31页I think it no use arguing with him.参考： It is no use arguing with him.I found it very interesting to study English.参考： It was very interesting to s

9、tudy EnglishHe made it clear that he was not into the car.参考： It was clear that he was not into the car. Many new reserves have been built, _(这使这些猴子可能) to survive. which makes it possible for the monkeys第13页/共31页it作形式宾语的特殊句型作形式宾语的特殊句型结构动词+ it + if/that/when动词有喜欢类：enjoy, like, appreciate, prefer 讨厌类：

10、hate, dislikeI would appreciate it if you paid in cash.I like it when my mother is happy.I hate it when people talk with their mouths full. 其他类：see to it that, owe it to sb thatrely/depend on it that, take it for granted that,leave it to sb that, make it a rule that注意：keep/bear in mind that 中间没有it 第

11、14页/共31页See to it that the baby must be fed when hungry but not too much. 留意，务必留意，务必He took it for granted that he would pass the exam. 想当然地认为Dont depend/rely on it that he will arrive on time. (指望)I owed it to Tom that I found the job I wanted. 把归功于某人I will leave it to you whether you go abroad or

12、not.I have made it a rule that I will do some English reading every day.习惯做，规定必须做，经常做第15页/共31页六、用于强调句型中It + be+被强调部分 + that/who(a person)从句I met Tom in the park yesterday.1) It was I who met Tom in the park yesterday.2) It was Tom who I met in the park yesterday.3) It was in the park that I met Tom

13、yesterday.4) It was yesterday that I met Tom in the park.It was five oclock _ I got home.It was at five oclock _ I got home.whenthat第16页/共31页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。如: It was not until she took off her dark glasses that I realized sh

14、e was a famous film star. = Not until she took off her dark glasses did I realize she was a famous film star. = I didnt realize she was a famous film star until she took off her dark glasses.第17页/共31页七、it 常用的固定搭配 make it在口语当中相当于succeed, 表示: 成功、做到、说定、赶上、及时到达 如: I wonder if they can make it.我在想他们是不是能办

15、得到。Most of the time they make it.很多时候他们真的做到了。 第18页/共31页2. take it 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 al

16、l depends.第19页/共31页4. Its up to sb. 在口语中, 相当于its decided by sb. 表示“由决定, 由负责, 取决于” Shall we go out for dinner？ Its up to you.第20页/共31页高考链接1. He didnt make _ clear when and where the meeting would be held. (天津2007) A. this B. that C. it D. these 2. _ is our belief that improvements in health care will

17、 lead to a stronger, more prosperous economy. (浙江2006)A. As B. ThatC. This D. ItCD第21页/共31页3. The doctor advised Vera strongly that she should take a holiday, but _ didnt help. (2005全国)A. it B. she C. which D. he4. Id appreciate _ if you would like to teach me how to use the computer. (山东2006)A. tha

18、tB. it C. this D. youAB第22页/共31页5. It was _ he came back from Africa that year_ he met the girl he would like to marry. (江西2009)A. when; then B. not; untilC. not until; that D. only, when6. It was along the Missippi River _Mark Twain spent much of hid childhood.(天津2008)A. how B. which C. that D. whe

19、reC C 第23页/共31页Exercises:1. I hate _ when people talk with their mouths full. A. it B. that C.these D. them 2. In which play is _ your brother will appear? A. that where B. this when C. it that D. it where3. _ the harder you work, the better result youll get. A. Its believed that B. What we believed

20、 that C. Its fact D. What the fact isACA第24页/共31页4. Nothing can stop us, _? A. cant it B. can it C. cant we D. can we5. -Can you tell us how the war was won in the end ? - I dont know, _. A. Its hard to say B. It doesnt matter C. Its no use saying D. It depends on the workBA第25页/共31页6. Does _ matter

21、 a lot whether she will come here by bus or by taxi? A. The thing B. that C. it D. her mother7. -Listen! Someone is unlocking the goods. -_ must be your father coming back from Beijing. A. It B. There C. That D. ThisCA第26页/共31页8. -Have you written a letter to her ? -No, but Im going to write _ tonight. A. it B. that C. those D. one10.