it做形式主语 优质课件

1、. it 用作形式主语 .1 代替主语从句 1）It is + adj. +that 从句 It is clear ( obvious ， true ， possible certain.) that . “ 清楚（显然，真的，肯定）” It is very clear that hes round and tall like a tree. . It is important ( necessary ， right ， strange ， natural.) that . that 后的从句中要用虚拟语气（ should + 动词原形）， should 可以省去，建议记住该句型中的形容词。

2、It is important that we (should) learn English well. 2）.It is +v-ed +that 从句 It is said (reported ， learned.) that . 据说（据报道，据悉）“。 It is said that he has come to Beijing. . It is suggested ( ordered / demanded/ insisted/ commanded. ) that . 主句中的过去分词是表示请求，建议，命令等词时， that 后的从句要用虚拟语气（ should + 动词原形）， sho

3、uld 可以省；常译为“据建议；有命令） It is suggested that the meeting ( should ) be put off. = He is said to have come to Beijing. 3）. It is a pity ( a shame . ) that . 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，常译为可省去表示出乎意料，常译为“竟然竟然”。没有。没有 这种意义时，则不用虚拟语气。这种意义时，则不用虚拟语气。 It is a pity that such a thing ( should

4、 ) happen in your class. It is a pity that he is ill. 4). It is time ( about time ，high time ) that . 该句型中that 后的从句应该用虚拟语气，值得注意的 是常用过去时态表示虚拟常译为“是（正是）的 时侯” It is time that children went to bed. It is the first ( second . ) time that . “ 是第一（二）次”。 It is the first time I have been here. = This is the f

5、irst time I have been here. 5). It happens (seems ， looks ， appears ) that. 该句型中it是形式主语，that 引导的是主语从句，主 句中的happen ， seem等词是不及物动词。 It happened ( so happened ) that he met his teacher in the street. 碰巧. It seems that he will be back in a few days. 看 来 6). It doesnt matter whether ( if ) . 该句型中whether(

6、if) 引导的从句是真正主语， 该句型常译为不论（是否）没关 系。 It doesnt matter if they are old. .2.作形式主语替代不定式作形式主语替代不定式 1). It takes sb. . to do sth. 做要花费某人 It took thousands of people many years to build the Great Wall. 2). It is kind ( of sb. ) to do sth. 主句中的形容词必须是能表示逻辑主语特征的形容词。 常见的有： bad ， brave ， careless ， clever ， cruel

7、 ， foolish ，stupid ， wise wrong 等。 这个句型可以改写为：sb. is kind to do sth. 。 It is kind of you to say so. = You are kind to say so. 3). It is necessary ( for sb. ) to do sth. 常见的形容词有： important ， necessary ， natural easy ， safe ，common ，normal ，hard ， difficult ,dangerous ， 等。 在中的形容词作表语可以用从句改写， 如： It is im

8、portant for her to come to the party. = It is important that she (should ) come to the party. It is no good (use ) doing sth. 该句型中的真正主语是动名词短语，主句中的表该句型中的真正主语是动名词短语，主句中的表 语可以是no good , no use ,useless It is no good learning English without writing English. Its useless trying to argue with Shylock. .3.

9、作形式主语替代ing形式 . It looks ( seems ) as if . 常译为，常译为，“看起来好象看起来好象” 如果与事实不相符合，则用虚拟语气 It looks as if he is ill. （真的病了） It looks as if he were ill. （没有生病） It seemed as if he were dying. . It is up to sb. to do sth. It is up to him to clean our classroom today. 今天应由他做教室清洁。 It is up to parents to teach their

10、 children manners. 该由父母教孩子礼貌。 It is your turn to clean our classroom today. . It is ones turn to do sth. 今天该轮到你做教室清洁。 It is no wonder that he didnt want to go. No wonder he didnt want to go. . It is no wonder that 在该句型中如果用肯定形式，表示“真奇怪， 真是令人惊讶”； It is a wonder that he reused such a good offer. 真奇怪，他拒绝

11、了这样好的帮助。 难怪他不愿去。 4. It 作形式宾语. We think it important to learn a foreign language. 该句型中的it 作形式宾语，为了记忆方便我们可称该句型 为 6123结构 。 6指主句中常用的动词： think,believe,make,find,consider,feel； 1指的是形式宾语it； 2指的是宾补的两种形式：形容词或名词； 3指的是真正宾语的三种形式：不定式短语，动名词短语 或that引导的宾语从句。 We think it our duty to clean our classroom every day. He

12、 felt it important learning English well. They found it difficult that they would finish their work in two days. find possible 1. S+ think + it + necessary +( for sb. ) to do sth. /that feel important Sentence patterns: Sentence patterns: 形式宾语 a rule 2. S+ V + it + ones duty + ( for sb. ) to do sth.

13、 /that an honour 3. S + V + it + no good + doing sth. no use We think it our duty to clean our classroom every day. He felt it no good playing computer games. They found it difficult that they would finish their work in two days. 该句型中的it是一个形式宾语，表示模糊意 思或代替后面that 引导的宾语从句。 因为在这个句型中的谓语动词都是需要跟宾 语的，但又不能直接

14、跟从句作宾语，于是就 得在从句前加上一个形式宾语it。 . We are counting on it that you will come. 常见的短语和动词有：count on ( 依靠， 指望，期盼), see to(负责), depend on ( 依 靠), rely on( 信赖，依靠)等。 I like _ in the autumn when the weather is clear and bright.(04全国) A. this B. that C. it D. one 点拨:这是it作形式宾语的一种特殊用法 .少数动词(如like, love, enjoy, disli

15、ke, hate, appreciate等)或包含介词的 动词短语(如see to, depend on等)后接宾语从句,必须先由 it担任形式宾语,再接从句. 1.I like (enjoy, hate) it when 2.I would appreciate it if 3.see to (depend on) it that Sentence patterns: C 形式宾语 ）make it 及时赶到;成功;办成 You can make it if you hurry. You neednt worry; he will make it . ）put it 说, 评价 “He is

16、 an honest man.” Tom put it. Special notice: Special notice: it be vs there be “ 是” “ 有” 1. _ someone at the door. I think _ the man to deliver the milk. 2. Lets hurry! _ a long way to go. 3. _ no need to hurry. We still get much time. 4. _ a wonder that he refuses such a good offer. There is it is There is There is It is It is? There is? 5. _ no doubt that he has done something bad. 6. _ no possibility that he will cheat us. 7. _ no good arguing with the unreasonable woman. 8. _ no difference between the two plans. There is There is It is There is 9._ was a time when 10._ is no denyi