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1、-it作形式主语与形式宾语形式主语形式主语是动词的一种，它也是, 可以把它归类到逻辑主语的第一种（不定式的逻辑主语）。用作宾语的不定式，用作目的状语的不定式，用作结果状语的不定式都是属于不定式的大概念里面的。详细用法综述形式主语it作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的，概括起来会有如下情况： 句子的逻辑主语为不定式如：It is very kind of you to give me a hand in time.It is my pleasure to address the meeting.It was pretty hard for
2、him to bring up the child on his own. 句子的逻辑主语为从句如：It so happened that the tickets were sold out.It is extremely obvious that she has been lying about her identity.It suddenly occurred to me that the message must have been hidden between the layers of the briefcase. 句子的逻辑主语为动名词短语这类句子远不如前面两种出现率高，主要在（n
3、o good, waste, useless, no use, dangerous）等词语的后面用。如：It is no use reasoning with him.It is no good reading in dim light.作形式主语的代词只能用it，不能用that、this等词。例如: 1）It is easier to lose friends than to make friends. 交朋友难而失去朋友比较容易。2）It is important for modern young people to master at least two foreign language
4、s. 掌握至少两门外语对于当代年轻人来说是很重要的。以上两句中的it是形式主语，真正的主语是后面的短语。3）It is considered no good reciting without understanding. 不理解的背诵被认为是没有好处的。4）It is no use crying over spilt milk. 覆水难收。以上两句中的it是形式主语，真正的主语是V-ing形式。5）It is a fact that English is being accepted as an international language. 英语作为一门国际语言正日益为人们所接受，这是不争的
5、事实。（it指代同位语从句）6）It depends on the weather whether we will go. 我们去不去得看天气行事。（其中的whether 不能换成if，因为if不能引导。）以上两句中真正的主语是。it 作形式主语主要用于下列三种情况l 不定式作真正主语主要用于下列句型：1. It + is/was + /n. +to do sth.A. 名词作表语。主要有a pity, a pleasure, an idea等。例如：In fact is a hard job for the police to keep order in an important footb
6、all match.A. this B. that C. there D. it答案为D再如：It is a great pleasure to do this. 这样做多好啊。It is a good idea to think this way. 这样考虑问题是个好办法。除be外，其他动词也有跟名词的情况。例如：It seems a pity to waste the food. 浪费这些食物真可惜。 It requires efforts to master a foreign language. 掌握一门外语需要种种努力。 B. 形容词或形容词短语作表语。分两种情况： 1）下列形容词：
7、kind, good, nice, clever, wrong, right, foolish, wise, unwise, stupid, rude, careless, cruel, brave, naughty, polite, selfish等词作表语时，不定式前常可加一个由of引起的短语，来说明不定式指的是谁的情况。形容词表示不定式逻辑主语的特征，即形容词用来描述不定式行为者的性格、品行等。例如：It was foolish of you to leave school. 你中途退学，真是傻瓜。It was brave of her to speak out in public. 她
8、能当众大声讲话，真勇敢。这种of sb. to do sth. 句型，of 的宾语可以作句子的主语。上面两个句子可以改写为：You were foolish to leave school.She was brave to speak out in public.2）其他形容词作，常见的形容词有：necessary, hard, important, difficult, easy, possible, common等。例如：It is necessary to use a short-wave radio to pick up the programmers. 必须用短波才能收到节目。如果要
9、说明不定式表示的动作是谁做的，可以在不定式前加for + 或 + to do sth.（for 后的宾语不能作句子的主语）。名词或代词作不定式的逻辑主语，即表示不定式所指动作的执行者。在此句型中，形容词只对不定式行为者作某种描述，而不涉及其品行。例如：It is not hard for one to do a bit of good. 对于一个人来说做点好事并不难。It is common for leaves to fall from the trees in the fall. 秋天树叶从树上落下是件常事。需要注意的是：动词不定式作主语，一般情况下用it作形式主语，而把（从句）放在后面。
10、也可以直接用不定式作。例如：It is wrong to tell lies. = To tell lies is wrong. 撒谎是不对的。但在疑问句和中，只能用it作形式主语。例如：Isnt it a good idea to have a walk around? 出去兜一圈难道不是一个好主意吗？What a pleasure it is to work with you! 同你一起工作是多么愉快啊！2. It + v. + to do sth.动词不定式作主语时除动词be以外，动词take, cost, need, require, make, sound, occur 等也可用it
11、作形式主语，而把动词不定式放在后面。例如：It took us three years to complete the project. 我们花费三年时间才完成了这项工程。It sounds reasonable to do it this way. 听起来这样做有道理。It needed hard work to finish the job. 要完成这项工作需要努力地工作。It didnt occur to me to ask him to help me. 我根本没想到要找他帮忙。l 动名词作真正主语用于这种形式的是一些特定的形容词和名词。例如：It was nice meeting y
12、ou. 见到你真高兴!（分别时用）它与不定式作真正主语的区别在于，说到的动作已经发生。例如：It is nice to meet you.（刚刚见面时用）it 作形式主语，动名词作真正主语主要用于下列句型：Its +n. /adj. + doing sth.1）下列形容词后常用动名词作真正主语：nice, good, useless, hard, foolish, enjoyable, worthwhile等。例如：It is nice talking to you. 跟你交谈真是愉快。Its foolish behaving like that. 这样的表现是很愚蠢的。It is usele
13、ss doing that. 那样做没用。2）下列名词或名词短语作表语时常用动名词作真正主语：use, good, fun, a waste of, job, task等。例如：Its a waste of time doing this. 这样做是浪费时间的。Its no good (use) doing that. 那样做没好处（没用）。Its an awful job doing this. 做这事真是一件可怕的差事。Its fun doing this. 做这事真有趣。It is not an easy task doing this work. 做这工作真非易事。l 名词从句作真正主
14、语用it 作形式主语的结构主要用于下列句型：It +谓语+名词从句（主语从句、表语从句、同位语从句）1. It is +名词+从句：这样的名词有a fact, a surprise, an honor(非常荣幸), a pity, common knowledge(常识)等。例如：It is common knowledge that the full moon brings fair weather. 皓月兆天晴，这是常识。It is a surprise that you gave such an answer to the question. 你对这个问题作了这样的回答，令人吃惊。2.
15、It is +形容词+：这样的形容词有natural, true, strange, necessary, important, obvious(很明显), certain, wonderful, funny, possible, likely, probable等。例如：It is certain that free medical care will be given to most people in our city. 我们城市的多数人将享受免费医疗，这是一定的。It is probable that he has known everything. 很可能他什么都已经知道了。3. I
16、t +动词+从句：这样的动词有seem, happen, appear, look, matter, make, strike, occur(突然想起)等。It appeared that he had a taste for music. 看来他对音乐有一定的鉴赏力。It made us very happy that she was saved.她能化险为夷令我们大家很高兴。4. It + be + +从句：这样的分词有said(据说), reported(据报道), believed(人们相信), known(众所周知), decided(已决定), proved(已证实), thoug
17、ht, expected, announced, arranged, amusing, puzzling, striking等。例如：It is said that Li Hao has been to Europe. 据说李郝去过。It was amusing that a rabbit ran out of the empty box on the desk. 桌上的空盒子里竟然跑出来一只，太有趣了。需要说明的是，大部分引导的主语从句都可以用 it充当形式主语。例如：It remains unknown when they are going to get married. 他们何时结婚依
18、然不明。It says in the newspaper that the enemy has been defeated. 报纸上报导敌人被打败了。形式宾语概述形式主语和形式宾语通常用在中，用it代替。u 形式主语的句子：it be adj./谓语+宾语+逻辑主语如It is useful to study English. 在这个句中真正的主语是后面的to do形式，it 叫形式主语。u 形式宾语的句子：主语+谓语+it+逻辑宾语如I think it interesting to dance. 真正的宾语是to do形式，it叫形式宾语。形式主语和宾语的使用都是为了简化语句，让别人一目了
19、然。当主语、宾语是很长的从句、不定式、动名词时常用“形式主语”和“形式宾语”来替代，而真正的主语、宾语置于句末。之所以用it 代替是避免头重脚轻。用法辨析1. 用“形式主语”的情况下，说明真正的主语（从句、不定式、动名词）较长， 用“形式主语”是比较符合英语习惯的。不用也可，但句子显得头重脚轻。如：That he won the game is true.不如It is true that he won the game.2. 在要用“形式宾语”的情况下，“形式宾语”是必须要用的。如：I find it hard to get along with her.不可把to get along wi
20、th her放在find 和 hard 之间。It作形式宾语的情况l It 代替不定式短语作形式宾语1. He feels it his duty to help others. 他觉得帮助他人是他的责任。2. The new medicine makes it possible to treat this terrible disease. 这种新药使治疗这种可怕疾病成为可能。l It 代替动名词短语作形式宾语1. We thought it no use doing that. 我们认为那样做无济于事。2. Our teacher thinks it no good learning wi
21、thout practice. 我们的老师认为光学不实践是没有好处的。l It 代替宾语从句作形式宾语1. I think it very important that we take part in the discussion. 我认为我们参加这次讨论是很重要的.2. Didnt I make it clear to you that I was not coming? 我不是向你明确表示过我不来了吗？3. I hate it when people are talking with their mouth full of food. 我讨厌人边说话边嚼东西。（when引导的从句为定语从句
22、，修饰it，而it又指代情形situation）4. Tom takes it for granted that his parents should give whatever he wants. 汤姆总以为他的父母会给予他所有他想要的东西。5. You must see to it that all the windows are closed before you leave the lab. 离开实验室前你务必要关上窗户。6. The couple didnt want it known that their house is empty. 这对夫妻不想让别人知道他们的房子没有人。7. Why do you call it dinner when we are eating at noon? We call it dinner when we have a lot to eat. 为什么你们把在中午吃的饭叫“正餐”？我们凡是将吃的很多时的饭都叫“正餐”。第 16 页-