知识点-it作形式宾语的结构课件

1、知识点it作形式宾语的结构课件知识点it作形式宾语的结构课件it作形式宾语的结构【知识点解析】一、基本用法1. it作形式宾语时，可以代替三种形式：不定式、动名词和宾语从句。2. it作形式宾语时，需具备两个条件：真正的宾语是不定式、动名词或从句有宾语补足语具备了这两个条件，形式宾语it一定要用。 it作形式宾语的结构【知识点解析】一、基本用法it作形式宾语的结构【知识点解析】二、it 作形式宾语的三种形式1. it代替不定式短语think/ find/ feel/ consider/ make/ regard+ it +形容词/名词 + 不定式短语，如：I find it pleasant

2、to work with him.(it 作形式宾语，代替不定式短语to work with him)我觉得和他一起工作很愉快。They felt it difficult to finish the work in such a short time.（it 作形式宾语，代替不定式短语to finish the work in such a short time）他们认为在这么短的时间内完成这项工作是困难的。it作形式宾语的结构【知识点解析】二、it 作形式宾语的三种it作形式宾语的结构【知识点解析】She thinks it her duty to help us.（it 作形式宾语，代替

3、不定式短语to help us）她觉得帮助我们是她的责任。I think it my honor to be invited to speak here.（it 作形式宾语，代替不定式短语to be invited to speak here）我觉得应邀在这儿演讲是我的荣耀。Tom didnt find it difficult to write letters in Chinese.（it 作形式宾语，代替不定式短语to write letters in Chinese）汤姆发现用汉语写信不难。it作形式宾语的结构【知识点解析】She thinks iit作形式宾语的结构【知识点解析】All

4、 these noises made it impossible for me to go on with the work.（it 作形式宾语，代替不定式短语to go on with the work）这些噪音使我无法继续工作。2. it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些)。如：The professor considers it no good reading without understanding.这位教授认为阅读而不理解没有益处。Do you consider it any good trying again?你觉得再试会有好处吗？ it作形式宾语

5、的结构【知识点解析】All these noit作形式宾语的结构【知识点解析】He found it useless( no use) arguing with him.他发现和他辩论没有用。He thought it absolutely senseless attempting the impossible.想做不可能的事情，他认为是完全没道理的。I dont think it worthwhile going to such a place.到这样一个地方去我看是不值得的。 it作形式宾语的结构【知识点解析】He found it it作形式宾语的结构【知识点解析】3. it代替宾语从句

6、：如：We all thought it a pity that the conference should have been cancelled.会议取消了我们都感到很遗憾。I took it for granted that they were not coming.我想他们准是不会来的了。Ill see to it that everything is ready in time.我负责使一切都按时准备好。 it作形式宾语的结构【知识点解析】3. it代替宾语从句：如it作形式宾语的结构【知识点解析】三、含it 的常用句型英语中有一些固定句型中含有it,应注意这些句型的使用。1. It

7、 be + 被强调部分 + that/ who + 其他成分强调句型可以强调一个句子的主语、宾语、表语及状语等成分。如果被强调的成分是表示人的词，可以用that或who(whom)连接其他成分；被强调的成分是表示人以外的词，例如表示事物、时间或地点的词，用that连接其他成分。例如我们可以用强调句型强调下列句子的主语（如）、宾语（如）、地点状语（如）及时间状语（如）原句：I met Peter in Japan last year. It was I who/that met Peter in Japan last year.（强调主语I） it作形式宾语的结构【知识点解析】三、含it 的常用

8、句型it作形式宾语的结构【知识点解析】 It was Peter whom/that I met in Japan last year.（强调宾语Peter） It was in Japan that I met Peter last year.（强调地点状语in Japan） It was last year that I met Peter in Japan.（强调时间状语last year）注意：not until 也可用于强调句型，此句型也可以变为含it的强调句型。例1：Mr. Brown didnt come back until eleven oclock.可变为：It was n

9、ot until eleven oclock that Mr. Brown came back.例2 The rain didnt stop until midnight.可变为：It was not until midnight that the rain stopped. it作形式宾语的结构【知识点解析】 It was Peteit作形式宾语的结构【知识点解析】注意：强调句也可变为特殊疑问句例1：It was in 1949 that the PRC was founded.可变为：When was it that the PRC was founded?例2 Your dad work

10、ed in this factory two years ago.可变为：Where was it that your dad worked two years ago?22. Its + 地点状语+ that（强调句。如：It was in the town that I was born.(in the town为地点状语，强调句型)我出生在这个镇子。 it作形式宾语的结构【知识点解析】注意：强调句也可变为特殊it作形式宾语的结构【知识点解析】3. Its +地点名词+ where (定语从句)。如：It is the town where I was born.(the town 为地点

11、名词，定语从句)这是我出生的镇子。4. Its + 时间名词+ when(时间状语从句)。如：It was 8 oclock when he returned.(8 oclock 是时间名词，时间状语从句)他回来的时候是八点钟5. Its + 时间状语 +that(强调句)。如：It was at 8 oclock that he returned.(at 8 oclock是时间状语，强调句)他是在八点钟回来的。 it作形式宾语的结构【知识点解析】3. Its +地点名词it作形式宾语的结构【知识点解析】6. if it is convenient to you: 如果你方便的话。如：If i

12、t is convenient to you, you can start tomorrow.如果方便的话，你明天可以动身。7. believe it or not 信不信由你。如：Believe it or not, Ill go abroad next month.不管你信还是不信，我下个月要出国。Believe it or not, we were left waiting in the rain for two hours.信不信由你，我们冒雨一直等了两个小时。8. Its time thatdid / should do (定语从句)。 如：It is time that I wen

13、t and picked up my daughter from school.我该去学校接我女儿放学了。 it作形式宾语的结构【知识点解析】6. if it is cit作形式宾语的结构【知识点解析】Its high time that we stopped/should stop this practice.我们的确该停止这种做法了。9. It is /has beensincedid (时间状语从句)。如：It is just a week since we arrived here.我们来这里已一星期了。10. It wont be before用不了（多长时间）就会 如：It wil

14、l be a long time before we finish the task.我们还需要很长时间才能完成这项任务。11. It will bebefore得过（多长时间）才 如：It wasnt long before he learned to use the computer.不久他就学会使用计算机了。 it作形式宾语的结构【知识点解析】Its high tiit作形式宾语的结构【知识点解析】12. It wasnt before没过（多长时间）就 如：It was some time before he told me about this affair.过了一段时间之后他告诉了

15、我这件事。13. It wasbefore过了（多长时间）才如：It wont be long before we meet again.不久之后我们还会再见面的。四、易混用其他句型英语中有一些句型不含it, 但却易被误用了it，常见的有以下句型：it作形式宾语的结构【知识点解析】12. It wasntit作形式宾语的结构【知识点解析】1. There is something/nothing wrong/ the matter with sb. / sth.如：There is nothing wrong /the matter with him. Hes just pretending.

16、他没什么事，他只是在装呢。2. There is no doubt about对毫不怀疑或There is no doubt that对毫不怀疑。如：There is no doubt about his suitability for the job.毫无疑问，他适合这个工作。There is no doubt about the fact.关于这个事实毫无怀疑。There is no doubt that he is hard to deal with.毫无置疑他很难对付。it作形式宾语的结构【知识点解析】1. There is sit作形式宾语的结构【知识点解析】3. There is

17、no need (for sb.) to do sth. 没必要。如：There was no need for him to remain in Paris.他没有必要继续留在巴黎。There is no need for you to start yet.你现在还不必动身。4. There is no/a possibility that 没可能/有可能 (= It is impossible/possible that ) 如：There is a possibility that the train may be late.可能火车要晚点There is no possibility

18、that well see him this weekend.我们本周末不可能见到他。it作形式宾语的结构【知识点解析】3. There is nit作形式宾语的结构【知识点解析】5. There is a chance that 可能如：There is a chance that the sick child will get well.这个生病的孩子可能会好起来的。6. There be no/ some differences betweenand和之间没/有区别。如：There are some differences between the two languages.这两种语言之

19、间有些区别。it作形式宾语的结构【知识点解析】5. There is ait作形式宾语的结构【知识点解析】7. After what seemed + 时间。如：After what seemed a very long time, the wounded soldier came back to life.在经过似乎很长的一段时间之后，那个受伤的士兵苏醒了过来。8. There be difficulty/ trouble (in) doing sth.干有困难。如：There was no difficulty in finding him.找到他没费什么事。it作形式宾语的结构【知识点解

20、析】7. After whatit作形式宾语的结构【典型例题】1. He found _ to sleep. A. difficult to get B. it difficult getting C. it difficult to get D. that difficult to get答案：C解析：句意：他发现很难入睡。分析：find 后常接it作形式宾语的形式，句型为find+ it+ adj. +to do sth.结合选项可知C项正确。 it作形式宾语的结构【典型例题】1. He found _it作形式宾语的结构【典型例题】2. I think is impossible for me to climb such a high mountain. A. it B. this C. that D. these答案：A解析：句意：我想对于我来说爬上这么高的山是不可能的。it 代词，可代替物；也可作形式主语或形式宾语；this 这个，指示代词；that 那个，指示代词；these这些。 这里是句型It is +形容词+for sb. to do sth.，对于某