英语四级语法讲解从句

1、从从 句句 从从 句句 根据英语从句在句子中的作根据英语从句在句子中的作用，从句可分为三类：用，从句可分为三类：v名词性从句名词性从句 Nominal Clausesv形容词性从句形容词性从句 Adjectival Clausesv副词性从句副词性从句 Adverbial Clauses 名词性从句名词性从句 Including: 主语从句主语从句 Subject Clause 宾语从句宾语从句 Object Clause表语从句表语从句 Predicative Clause同位语从句同位语从句Appositive Clause形容词性从句形容词性从句 Restrictive 限制性定语从句限

2、制性定语从句Non-restrictive 非限制性定语从句非限制性定语从句Attributive Clause定语从句定语从句1 of Time （时间）（时间） 2 of Place（地点）（地点）3 of Cause（原因）（原因） 4 of Result（结果）（结果）5 of Purpose（目的）（目的）6of Condition（条件）（条件）7 of Concession（让步）（让步） 8 of Manner（方式）（方式）9 of Comparison（比较（比较）10 of Analogy（类比）（类比）副词性从句副词性从句 Adverbial Clause状语从句状语从

3、句 从句类型的判定从句类型的判定： 看从句在整个句子中处在什么位看从句在整个句子中处在什么位置上、作什么句子成分。置上、作什么句子成分。 通常位于句子开头的从句是通常位于句子开头的从句是主语主语从句从句；动词后面的从句是；动词后面的从句是宾语从宾语从句句；系动词后面的从句是；系动词后面的从句是表语从表语从句句；名词后面的从句只能是；名词后面的从句只能是同位同位语从句语从句或或定语从句定语从句；其它情况则；其它情况则都是都是状语从句状语从句。主语从句引导词主语从句引导词从属连词从属连词: that, whether连接代词连接代词: what, which, who, whom连接副词连接副词:

4、 when, where, why, how1 That he is always ready to help others is known to all. 2 In some countries, _ is called “equality” doesnt really mean equal right for equal people. A which B what C that D oneB宾语从句引导词：宾语从句引导词：属连词属连词: that, whether, if连接代词连接代词: what, which, who, whom (词尾加词尾加-ever加强语气加强语气)连接副词

5、连接副词: when, where, why, how表语从句引导词：表语从句引导词：从属连词从属连词: that, whether, if 连接代词连接代词: what, which, who, whom 连接副词连接副词: when, where, why, howThe question is whether we shall stay or not. / how we can get there. / whom he is looking for. / who he is.The reason is (that) he is ill.Thats what they did. / why

6、 I didnt come.同位语从句引导词：同位语从句引导词：从属连词从属连词: that, whether连接副词连接副词: when, where, why, howthat: 无意义无意义,不做成分不做成分,但不能但不能 省略省略.同位语从句所修饰的名词被称为同位语从句所修饰的名词被称为先行词先行词. 常见先行词有：常见先行词有： idea, fact, news, hope, belief, thought, doubt, question, sign, suspect, 以及表示以及表示“建议、命令、请求建议、命令、请求”的词的词 (后者句中要用虚拟语气后者句中要用虚拟语气). T

7、he question whether it is right or wrong depends on the results. There was the question where we were to go. / what we were to do. / when we were to start. / how we could get there. / why we should help them.定语从句引导词：定语从句引导词：关系代词关系代词: who, whom, whose that, which, as 关系副词关系副词: when, where, why = 介词介词

8、+关系代词关系代词 1 定语从句引导词在句中定语从句引导词在句中起三个作用起三个作用:引导和连接主、从句引导和连接主、从句在从句中作某种成分在从句中作某种成分替代先行词替代先行词（因此从句中不能再有先行词或其（因此从句中不能再有先行词或其代词）代词）that, which: 先行词为事、物先行词为事、物, 在句中可作主语、宾语；在句中可作主语、宾语；who, whom: 先行词为人先行词为人, 在句中可作主语、宾语；在句中可作主语、宾语；whose: 先行词为人、事、物先行词为人、事、物, 在句中作定语；在句中作定语；as: 先行词被先行词被 the same, such修饰修饰或先行词本身就

9、是或先行词本身就是 the same, such;引导非限定性定语从句引导非限定性定语从句, 代替整代替整个句子个句子, 在从句中作主语或宾语在从句中作主语或宾语.It wasnt such a good dinner as she had promised us. As is well known, Rome is not built in a day.As we all know, Rome is not built in a day. This is the city _.A I like to visit it most B I like to visit mostC I most l

10、ike to visit D I most like to visit itB Beer is the most popular drink among male drinkers, _ overall consumption is significantly higher than that of women. A whose B which C that D whatA The hours _ the children spend in their one-way relationship with TV people undoubtedly affect their relationsh

11、ips with real-life people. A when B on which C that D in whichC2 只用只用which引导定语从句的情况引导定语从句的情况:引导非限定性定语从句引导非限定性定语从句;在介词后面在介词后面;句中已有连词句中已有连词that为避免重复；为避免重复；He told me that the radio which he had bought was defective.3 只用只用that引导定语从句的引导定语从句的情况情况:先行词既包括人又包括物先行词既包括人又包括物;先行词前有不定代词修饰或本身为先行词前有不定代词修饰或本身为指物指物不

12、定代词不定代词or复合不定代词时复合不定代词时;先行词前有表示唯一概念的词修饰先行词前有表示唯一概念的词修饰;先行词被序数词、先行词被序数词、adj.最高级修饰最高级修饰;先行词本身为疑问先行词本身为疑问pron.时；时；or句中句中有疑问代词；有疑问代词；关系代词在定语从句中作表语时关系代词在定语从句中作表语时,多多用用that ; He talked loudly of the men and the books that attracted him. You can take any seat that is free. All that glitters is not gold. Th

13、ere is little / nothing that I can do.Nothing is difficult for one who sets his mind to it. He is the only person that is reliable. These are the very points that interest me. The first step that we are to take is very difficult. She has become one of the best actresses that appear on Chinese screen

14、s. Who that have studied with him do not admire him?Who is the man that you were talking to when I saw you yesterday? She is not the girl that she was three years ago. Mary is no longer the girl that she used to be. 介词介词+关系代词关系代词 不定不定pron. / 数词数词 + 介词介词 + 关系代关系代词词which / whom / whose + n.介词判定依据：介词判定

15、依据：介词与关系代词介词与关系代词 (即先行词即先行词)为固为固定搭配定搭配介词与从句中某一词为固定搭配介词与从句中某一词为固定搭配This is the room where / in which they lived for ten years.This is the room that / which they lived in for ten years.It is useful to be able to predict the extent to which a price change will affect supply and demand. Agriculture was

16、a step in human progress _ which subsequently there was nothing comparable until our own machine age. A to B for C in D fromA I bought a dozen eggs, _ broke when I dropped the box at the door. A six eggs B six eggs of them C six of them D six of whichD He introduced me to his students, _ offered to

17、go with me as a guide. A one of them B one student C one of whom D one of whichC The residents, _ had been damaged by the fire, were given help by the Red Cross. A all of their homes B all their homes C whose all homes D all of whose homesD This is the theory _ which his experiment is based. A from

18、B to C on D forC时状常见引导词：时状常见引导词： when, while, until / till, as, before, after, since, whenever, as soon as, once, n.短语：短语： the moment / each time / every time / the distance + clause no soonerthan hardly/ scarcelywhen 考点：考点：1 when “正在这时正在这时”2 It is a long time before / after 3 It is / was since （完成时

19、）（完成时）4 no soonerthan hardly/ scarcelywhen时态时态:主句用过去完成时主句用过去完成时; 从句用过去时从句用过去时.否定副词提到句首否定副词提到句首, 句子要部分倒装句子要部分倒装.5 until / till not until 强调句式强调句式: It is/was not until +从句从句 + that +主句主句 not提到句首提到句首,句子倒装句子倒装 Not until +时间状语（从句）时间状语（从句）+ 部分倒装的主句部分倒装的主句1 I had just started back for the house to change m

20、y clothes _ I heard voices. A as B when C after D whileB2 No sooner had we reached the top of the hill _ we all sat down to rest. A when B then C than D untilC3 Doing your homework is a sure way to improve your test scores, and this is especially true _ it comes to classroom tests. A when B since C

21、before D afterA4 A man escaped from the prison last night. It was a long time _ the guards discovered what had happened. A before B until C since D afterA5 You see the lightning _ it happens, but you hear the thunder later. A the instant B for an instant C on the instant D in an instantA6 It was alm

22、ost 10 years _ I had seen her last time. A before B after C when D since D地点状语从句常见引导词：地点状语从句常见引导词： where, whereverBoys always go to swim where the water is deep.Where there is a will, there is a way.原因状语从句常见引导词：原因状语从句常见引导词： because, as, for（并列句）（并列句）, since, that, in that, now that seeing (that); gi

23、ven (that)She was disappointed that her services had been overlooked by her superiors.Seeing (that) he was better, they didnt send for the doctor.Given (that) she is interested in children, Im sure teaching is the right career for her. = Given her interest in children, Im sure teaching is the right

24、career for her.结果状语从句常见的引导词：结果状语从句常见的引导词： so(并列句并列句), that, so that; sothat; suchthat; So much so that 表示程度，引导结果分句表示程度，引导结果分句-Does Allen like hamburgers?-Yes. So much so that he eats them almost every day.It was so cold that the river had frozen.It was such an interesting story that I couldnt stop r

25、eading it. 目的状语从句常见引导词：目的状语从句常见引导词： that, so that; in order that; lest, for fear that (虚拟语气虚拟语气); in case (虚拟语气虚拟语气)Man does not live that he may eat, but eats that he may live.Here is my telephone number so that you can call me when you arrive here next time.The driver looked at the engine carefull

26、y lest it (should) go wrong on the way.条件状语从句常见引导词：条件状语从句常见引导词： if, unless, as /so long as, in case (虚拟条件句用虚拟语气虚拟条件句用虚拟语气), on condition that, providing / provided (that)suppose / supposing (that)You cant pass the exam unless you work harder.If it rains tomorrow, I will go to school by taxi.I can le

27、nd you my dictionary as long as you can keep it clean.Please let me know in case he comes.She would be prepared to come to the party, provided / providing that she could bring her daughter.Supposing / Suppose all the doors were locked, how would you get into the house?让步状语从句常见引导词让步状语从句常见引导词: though,

28、 although, as, even if/ though, while for all that.（尽管（尽管 whetheror（省略倒装）（省略倒装）; no matter + 特殊疑问词特殊疑问词 / 特殊疑问词特殊疑问词+-everEven if it is raining very hard, he would still go to take care of the young trees in the schoolyard.He is a good comrade for all that he may have shortcomings and faults.1as引导让步

29、状语从句引导让步状语从句,必须用倒装语序必须用倒装语序;though引导让步状语从句可倒装可不引导让步状语从句可倒装可不倒装倒装;although引导让步状语从句不能引导让步状语从句不能倒装倒装. 倒装情况倒装情况：a 把从句中作表语的把从句中作表语的adj./n.提到句首；提到句首；若表语为单数可数名词，提前时要省若表语为单数可数名词，提前时要省略（即去掉）不定冠词略（即去掉）不定冠词.b 把从句中作状语的把从句中作状语的adv.提到句首提到句首.c 有时把从句中的谓语动词原形提到句有时把从句中的谓语动词原形提到句首首.Air exists everywhere although we ca

30、nt see it. Though it was very late, they went on working.Child as he is ,he can speak English fluently.Much though he likes her, he doesnt love her.Fail as he did, he would try again.2 no matter+特殊疑问词特殊疑问词or特殊疑特殊疑问词问词+-ever引导让步状语从句引导让步状语从句注意词序：注意词序： no matter how / however + adj./adv. no matter what

31、 / whatever + n. +从句中有时要用虚拟语气从句中有时要用虚拟语气: may+动词原形动词原形 或直接用或直接用动词原形动词原形； 有时还要用倒装语序有时还要用倒装语序;However rich people are, they always seem anxious to make money.No matter what difficulties we may have, we have confidence in ourselves.Whatever may come, we wont leave the work half done.Come what may, we w

32、ont leave the work half done.Whoever you be, you have no right to do such a thing.3 whetheror引导让步状语从句，引导让步状语从句，常省略常省略whether,且把动词原形且把动词原形be提提到句首到句首.Be rich or poor, he is kind to everybody. (Whether he is rich or poor)Be friend or foe, the law regards him as criminal. (Whether he is a friend or a fo

33、e, )方式状语从句常见引导词：方式状语从句常见引导词： as, as if / though (虚拟句用虚拟语气虚拟句用虚拟语气)When in Rome, do as the Romans do.He looks as if he is ill. He talks as if he were a scholar.He speaks as if he had seen it with his own eyes. It looks as if it might rain.比较状语从句常见引导词：比较状语从句常见引导词： as /soas; than ; The more, the more;

34、the same as; suchas no less than no more than = not any more than not so much as Eg no lessthan 表示表示“在在方面不比方面不比差差”John is no less hardworking than his sister, but he failed in the exam. Anotany more than B Ano morethan B “正如正如A不能不能, B也不能也不能” “A和和B一样都不一样都不”He is no more able to read Spanish than I am

35、.= He is not able to read Spanish any more than I am. It is not so much A as B “与其说与其说A, 毋宁说毋宁说B”It is not so much the language as the cultural background that makes the book difficult to understand.He knew about the newcomer as much as I did.He finished the exam earlier than his classmates did.She is the same age as you. We are not such fools as to believe him.The harder you work, the more achievement you will make. 排斥问题排斥问题 China is larger than any country in Africa. China is larger than any o