专四必考语法一、时态、语态1.表达将来时的形式：(1)在时间、条件、让步从句中，一般现在时代替将来时，但要注意区别从句的类型，如：I’ll tell him when you will ring again. (宾语从句) 比较：I’ll tell him when you ring again. (状语从句)(2)在make sure, make certain, see (to it) 后的that从句中，谓语动词用一般现在时代替将来时，如：See to it that you include i n the paper whatever questions they didn’t know the answer to last time.(include 不能用will include或其他形式)2.完成时是时态测试的重点，注意与完成时连用的句型和时间状语：(1)by/between/up to/till +过去时间、since、by the time/when +表示过去发生情况的从句，主句用过去完成时。
如：We had just had our breakfast when an old man came to the door.Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed had been produced.(表示1919年时已发生的情况)(2)by +将来时间、by the time/ when +谓语动词是一般现在时的从句，主句用将来完成时。
如：By the time you arrive in London, we will have stayed in Europe for two weeks.I hope her health will have improved greatly by the time we come back next year.(3)by now、since +过去时间、in/during/for/over/the past/last few(或具体数字)years/days/months，主句用现在完成时, 但在it is +具体时间since/before这一句型中，主句更多的时候不用完成时。
专四语法部分一、总体概况：语法考点：三大从句——名词、定从、状从非谓语动词时态、语态、语气、情态动词其他二、从句讲解三大从句（一）三大从句五种基本句式主语+谓语vt+宾语主语+谓语vt+宾语+宾语主语+谓语vt+宾语+补语主语+谓语vi+状语主语+系动词+表语状语，主语（定语）谓语宾语状语(定从) 系动词表语（状从）（同位语）（非谓语）（非谓语）（介词短语）（介词短语）（副词）长难句解题技巧：抓住干，定从句逗号原则：在英语句子中，逗号是不能连接两个独立完整的句子的。
名词性从句三大从句（二）两步解题法1.抓连词2.状从中的连接词——常考固搭so…that in order that such…that with the result that so thatthat引导名词性从句——that+完整句子（1）主语从句e.g. It is true that he passed the exam.It is said that he passed the exam.It is a pity that he didn’t pass the exam.强调句式It is/was+被强调部分+that+不完整句子主、宾、表、状e.g. I met him in the street.It was him that I met in the street.It was in the street that I met him.(2)宾语从句主+谓语vt+（that）+完整句子e.g. I know (that) he passed the exam.（3）表语从句主+系动词+that+完整句子e.g. My suggestion is that he go with us tomorrow.(4)同位语从句抽象名词+that+完整句子e.g. My suggestion that he go with us tomorrow.There is/are +抽象名词+that+完整句子Answer,belief,concept,conclusion,decision,discovery,doubt,evidence,sign,fact,hope,idea,informati on,knowledge,suggestion,thought,probability…On the condition that…Despite the fact that…On the understanding that…that 引导限定性定从all some any one(s) every each…the first the lastthe only the veryn+that+不完整句子作从句中的主、宾、表语e.g. The book that was written by him is pop.that引导同位语从句抽象名词+that+完整句子that 引导限定性定从n+that+不完整句子作从句中的主、宾、表语The fact that he passed the exam was true.The fact that he found was true.三大从句（三）What=all that; the thing that; the person thatWhat 只引导主从、宾从、表从,不能引导定从和同位从What+不完整句子What he said made me happy.e.g. _____it turned out,it was Italian movie.A What_____it turned out was Italian movie.A WhatI know what he said.I listen to what he said.This is what he said.词______+ 不完整句子n A what Xvt/介词/系动词 A what 可以考虑词，_______+不完整句子A whatB whichC thatwhat 与how 的区别I don’t know what to do.I don’t know how to do it.I’m thinking of ______to do about it.A.whatB. how介词短语在句子的位置1）作状语句子+介短/介短+句子2）作定语n+介短3）作表语系+介短wh—ever与no matter wh—区别让步、名从让步I don’t believe whatever he said.Whatever happens,don’t panic.公式however + adj/adv + 主语+ 谓语e.g. It caused them to think about _______they might control the experiences of children to duce responsible and productive adults.A. whatB. howC. whateverD. however if 与 whether 的区别 if_______about the university the mind, love, dreams, or ordering a drink. A) whatB) whether C) while D) if Never ask a child _______he likes or dislikes.A) what B) whether C) that D) which We know, however,________ no two places are exactly the same. A) Although B) whether C) since D) that 三大从句（四） 定语从句两步解题法1. 抓先行项（指人、物、整句话内容）2. 抓关系词在定语从句中的成分e.g. This is the house_______①I once lived.②I once visited.①where/in which②that/which/xThis is the very house_________ I once visited.e.g. I’ll never forget the day______①I met him.②I spent with him.①when/on which②that/which/xI’ll never forget the very day______ I spent with him. 地点n where 主+谓vt+宾/宾/宾补主+谓vi主+系+表时间n when 主+谓vt+宾/宾/宾补主+谓vi 主+系+表the reason why 主+谓vt+宾/宾/宾补 主+谓vi 主+系+表 三大从句（五）Which 在专四考试中，只考定语从句。
专四必备语法一、时态、语态时态、语态需要掌握的要点：1.表达将来时的形式：（1）在时间、条件、让步从句中,一般现在时代替将来时，但要注意区别从句的类型，如：I'll tell him when you will ring again。
我告诉他你什么时候再来电话。
(宾语从句）比较:I’ll tell him when you ring again。
你再打电话时我告诉他。
（状语从句）（2)在make sure，make certain, see (to it) 后的that从句中，谓语动词用一般现在时代替将来时，如：See to it that you include in the paper whatever questions they didn't know the answer to last time。
（include 不能用will include或其他形式）2.完成时是时态测试的重点，注意与完成时连用的句型和时间状语:(1）by/between/up to/till +过去时间、since、by the time/when +表示过去发生情况的从句,主句用过去完成时。
如：We had just had our breakfast when an old man came to the door。
Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed had been produced.(表示1919年时已发生的情况）（2）by +将来时间、by the time/ when +谓语动词是一般现在时的从句，主句用将来完成时.如:By the time you arrive in London, we will have stayed in Europe for two weeks.I hope her health will have improved greatly by the time we come back next year.(3）by now、since +过去时间、in/during/for/over/the past/last few（或具体数字)years/days/months，主句用现在完成时, 但在it is +具体时间since/before这一句型中，主句更多的时候不用完成时。
一、附加疑问句 (2)二、比较句式 (2)三、倒装 (4)四、虚拟语句 (5)五、非谓语动词 (8)六、从属分句 (10)(一)状语从句 (10)(二)关系从句（定语从句） (13)(三)名词性从句 (14)一、附加疑问句附加疑问句由两部分组成，前面是一个陈述句，后面是一个简短问句，下面分析几种特殊的附加疑问句形式：1. 如果陈述部分是祈使句，附加疑问句部分一般使用will you, w on’t you例如：Pass me some salt, won’t you?递给我一些盐，好吗？2. 如果陈述部分的主语是this, that, these, those时，附加疑问句部分的主语为it或they例如：This is exciting, isn’t it?这很令人兴奋，不是吗？3. 如果陈述部分是一个复合句，则分两种情况：1) 一般情况下，附加疑问句部分的主语应与陈述部分的主语保持一致，例如：Mary said her son would come, didn’t she? 玛丽说她的儿子要来，不是吗？2) 但如果陈述部分的主语是第一人称，且谓语动词是suppose, think, believe等，附加疑问句的主语则应该与从句的主语保持一致，例如：I think he will come, won’t he?我认为他会来，不是吗？4. 如果陈述部分是there be存在句，附加疑问句部分的主语也应该用there例如：There are some books, aren’t there?有一些书，不是吗？5. 如果陈述部分中带有否定词或半否定词，如never，hardly，scarcely，seldom，no，none，no one，rarely，nowhere，nothing，nobody，few，little等，附加疑问句的谓语要用肯定形式例如:There are rarely extremes of cold or heat in Britain, are there？英国很少出现严寒或酷暑天气，是吗？二、比较句式1. 形容词、副词比较级和最高级的用法1) 比较级修饰语(a) 比较级之前的副词修饰语常用many, much, far, a little, a bit, slightly, a great deal, a lot, somewhat, rather, etc.。
