主语从句定义 在复合句中充当主语成分的句子叫做主语从句.第一部分 常规主语从句，即句子在复合句中充当一个主语 主语从句的时态：不受主句的时态影响和限制。 （1）That he finished writing the composition in such a short time surprised us all. （2）Whether we will go for an outing tomorrow remains unknown. （3）Who will be our monitor hasn't been decided yet. （4） Whom we must study for is a question of great importance. （5）What caused the accident remains unknown. （6）Whatever you did is right. （7）Who the watch belongs to was lost is unknown. （8）What we need is time. （9）What we need are good doctors. 小结: （1)引导主语从句连词有that,whether,who,what,whatever等 （2)连词位于句首不能省略 （3)主语从句大多数情况下视为单三,但也有例外,如例（9） 第二部分 为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正主语搁置于句末 （1）It is certain that he will win the match. （2）It is true that he has made a very important discovery in chemistry. （3）It is very likely that they will hold a meeting. （4）It is strange that he should do that. （5）It is important that we all should attend the meeting. （6）It is strange that the man should have stuck to his silly ideas. （7）It is a pity that we won't be able to go to the south to spend our summer vacation. （8）It is still a mystery what caused the accident. （9）It is said that he has gone to shanghai.(=He is said to have gone to shanghai) （10）It is known to all that the gun powder was first invented by the Chinese. （11）It is suggested that the work should be done with great care. （12）It seems that he has seen the film.(=He seems to have seen the film) （13）It happened that the two cheats were there. (=The two cheats happened to be there) 小结: （1)以that 引出的主语从句,常以形式主语it引导. It is +形容词/名词/某些动词ed + that 从句. （2) 在有些that从句中要用虚拟语气 (should+do/should+have done)例句4,5,6,11. [编辑本段]主语从句的用法 主语从句与宾语从句两者的用法和在句中的作用是不同的，下面从它们的各自用法来介绍。 一．主语从句 主语从句 定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。 1. It 作形式主语和it引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。例如： It is a pity that you didn’t go to see the film. 2. 用it 作形式主语的结构 (1) It is ＋名词＋从句 It is a fact that … 事实是… It is an honor that …非常荣幸 It is common knowledge that …是常识 (2) it is ＋形容词＋从句 It is natural that… 很自然… It is strange that… 奇怪的是… (3) it ＋不及物动词＋从句 It seems that… 似乎… It happened that… 碰巧… (4) it is＋过去分词＋从句 It is reported that… 据报道… It has been proved that… 已证实… 3. 主语从句不可位于句首的五种情况 (1) if 引导的主语从句不可居于复合句句首。 (2) It is said , (reported) …结构中的主语从句不可提前。例如： It is said that President Jingo will visit our school next week. (3) It happens…, It occurs… 结构中的主语从句不可提前。例如： It occurred to him that he failed in the examination. (4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如： It doesn’t matter whether he is wrong or not. (5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如： Is it likely that it will rain in the evening? 4. What 与that 在引导主语从句时的区别 What 引导主语从句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如： What you said yesterday is right. 二：宾语从句用以区分主语从句的几个特征： 1、引导词：what\which\whose\when\whether\if\where 2语序：宾语从句必须是用陈述语句。 如：I think that you must work harder. 宾语从句的引导词、连接词的区别、否定转移等现象。 (1)表达时间的几个句型：一般用when或者是what time： What time will the train leave? 由于时刻都是固定的，也可以用一般现在时代替一般将来时： What time does the train leave? (2)时间的表达方式：8：19(nineteen past eight),7:57(three to eight)，在时间的中间也可以加上分的单词(minutes) (3)had better +动词原型。意思是提要求，建议。但是上下级不能用这种方式，因为语气太重： You had better give up smoking . (4)sb leave sth +地点 I left my book in my classroom yesterday. (5)may I have your name(address\age)?一般询问对方的年龄、名字等，不要习惯以前的问法，这样很不礼貌，而是要采访上面的问法。以前的习惯是：how old are you? \what's your name? (6)修饰名词的代词次序：限-描-大-形---年---颜----籍----物--------类+名词： this is a bridge. This is a beautiful bridge 补充：从句的语序永远是陈述句。 一、定义和宾从例句分析 宾语从句就是一个句子作动词或介词的宾语。 A 作动词的宾语: I heard the news. 主语 谓语动词 名词作宾语 I heard that he would come here later on. 主语 谓语动词 一个句子作宾语---宾语从句 B 作介词的宾语: He said nothing about the plan. 主语 谓语动词 代词作动词的宾语 介词 名词作介词的宾语 He said nothing about who broke the window last night. 主语 谓语动词 代词作动词的宾语 介词 一个句子作介词的宾语 二、带有宾语从句的复合句的构成 带有宾语从句的复合句就是用连接词把一个主句和一个宾语从句连接在一起。连接词有：that(可省略)，what, who, when, where, why, which, if, whether, how. 1 He suggested (that) we should clean the corridor every day. 宾语 2 He told me (that) he would leave Dalian airport at 8pm. 间接宾语 直接宾语 3 He told me where he was going to travel that summer. 间接宾语 直接宾语 4 He wanted to know what the manager had said at the meeting. who hadn’t passed the exam. when she would leave this building. why she cried last night. where she was going to study. which student was his partner in the short play. if (whether) Tom could play basketball with him that morning. how she managed to solve the problem. why water flows from a high position to a lower position. 在例子4中，当主句是过去时态时（一般过去时，过去进行时，过去将来时，过去完成时），从句根据不同情况必须使用过去时态的一种，（大自然的现象和真理除外）。 5 He is wanting to know what I can cook for dinner. who broke the window yesterday. when I can have a holiday. why I failed the exam yesterday. where I should have dinner with my friend tonight. which book is the best one. if (whether) I have passed the exam. how my cat escaped from the room last night. 在例子5中，当主语是现在时态时（一般现在时，现在进行时，一般将来时，现在完成时），从句可根据不同情况使用各种时态。 三、注意 A 宾语从句必须用陈述语序。 False: He is wondering when can he finish this difficult job. Right: He is wondering when he can finish this difficult job. B 有时候可以用it 作形式宾语，而把真正的宾语从句放在后面。 Bad: I thought that he could finish this job in just two hours impossible. Good: I thought it impossible that he could finish this job in just two hours. Bad: He left whether we should continue this project to my judgment. Good: He left it to my judgment whether we should continue this project. C 带有宾语从句的复合句的否定形式一般是否定主句。 Bad: I think he doesn’t like the English teacher. Good: I don’t think he likes the English teacher. D 主句一般过去时态，从句也要用过去时态；具体细节请看第一部分。 False: He wanted to know why he is crying in the corner. Right: He wanted to know why he was crying in the corner. 宾语从句的点点滴滴 宾语从句是英语复合句中的其中非常重要的从句之一。它是用一个句子做另一个句子的宾语，将这个句子叫做宾语从句。宾语从句做介词或及物动词的宾语。现在从下列三个方面总结归纳如下： 一，引导词 A,由that 引导的陈述句性的宾语从句，在很多动词如say, think, wish , hope, see, believe, agree, expect, hear , feel等动词后。连词that只起连接作用，在从句中不做句子的成分，也无词汇意义，在口语中常被省略，但在大多数情况下还是以不省为好，特别是在笔语中。 例：I told him that he was wrong. l在think,believe, suppose, expect等动词引起的宾语从句中，有时谓语尽管是否定意义，却不用否定形式，而将think 等动词变为否定形式。 例：I don’t think you are right. (我认为你做的不对) l在许多带有复合宾语的句子中，that引导的宾语从句经常移到句子的后面，而用it做形式宾语。 例：We think it wrong that he told a lie to everyone (我认为他向每一个人撒谎是错误的) B,由连词if、 whether 引导的表示“是否…”的宾语从句。Whether,if 在从句中不做句子的成分，一般情况下，whether和if 可以替换。 例：I don’t know if/whether he will come tomorrow. The teacher asked if/whether we had finished the experiment. l在介词后面的宾语从句中不用if引导 例：Everything depends on whether we have enough money。 l宾语从句中有or not时不用if引导. 例：I don’t know whether the movie star will come or not. l和不定式连用作宾语时不用if引导. 例：Whether to go there or not hasn’t been decided. C,由wh-引导的宾语从句。连接代词who,whom,whose, what, which,和连接副词when, where, why, how 等连接的宾语从句，它们在句中即有连接从句的作用，又在句中充当句子的成分。 例：Do you know which film they are talking about? (which做定语) I don’t know where he lives. (where 做地点状语) 二，宾语从句的语序， 宾语从句从句的语序必须是陈述语序，即连接词+主语+谓语+其他成分 例：I believe that they will come soon. He asked me whether I was a teacher. They wanted to know what they can do for us. 二，宾语从句的时态。 宾语从句的时态受主句的限制， 既：主句是一般现在时态，从句根据实际情况而定。 主句是一般过去时态，从句用相应的过去的时态。如果从句的动作发生在主句之前，则从句要用过去完成时态。 例: 1)She says that she is a student. She said that she was a student. 2)She says that she will fly to Japan in a week. She said that she would fly to Japan in a week. 3)She says that she has finished her homework already. She said that she had finished her homework already. 4)She says that she can sing a song in English. She said that she could sing a song in English. l如果宾语从句说的是客观真理、自然现象或事实时，这时宾语从句要用一般现在时态。 例：The teacher said that the earth goes round the sun. He told me that Japan is an island country. lCould you tell me…是用来征询对方的意见，语气委婉，并不表示过去。 例：Could you tell me when we will visit the Histury Museum? 注意事项： u由陈述句变成宾语从句时，要注意人称的变化。 例：She said: “I have been to England before.” She said that she had been to England before. She asked me: “Do you like maths?” She asked me if I liked maths. u宾语从句与简单句的交换。 由连接代词和连接副词引导的宾语从句，如果宾语从句的主语和主句的主语是同一个人时，可以用“疑问词+不定式 ”做宾语的简单句结构。
主语从句作主语 宾语从句作宾语
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