英语中六大从句用法总结
1、定语从句 定语从句所修饰的先行词可以是名词或代词，也可以是一个句子。定语从句通常位于先行词之后，由关系代词或关系副词引导。
关系词在从句中的成分修饰的先行词可否省略关系代词that主语或宾语人、物作宾语时可省略which主语或宾语物作宾语时可省略who、whom、whose主语、宾语和定语人作宾语时可省略关系副词when、where、why时间状语、地点状语、原因时间、地点、原因一般可省略*限制性定语从句 限制性定语从句修饰先行词，对先行词起修饰作用，紧接先行词之后，无逗号，若省去，原句意思不完整。引导定语从句的关系代词有
who,whom,whose,which,that等。who,whom,whose用于指人，whose有时也可指物，相当于of which；which用于指物；that既可指人也可指物，但只用于限制性定语从句中。关系代词除了引导定语从句，替代先行词外，还在从句中担任主语、宾语、定语等。T he computers and cables which make up the Internet are owned by people and organizations、 Those who live alone or who are sick may have trouble in getting close to other people、 The girl whose parents died in an accident is living with her grandmother、1)当先行词是all,anything,everything,something,nothing等不定
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代词或先行词前有first,last,any,few,much,some,no,only以及形容词最高级修饰时，只能用关系代词that引导从句。T hat is all that Ive heard from him、 Hes the first person that Im going to interview this afternoon、2)关系代词的省略 在从句中作宾语的关系代词常可省略。关系代词紧跟介词，作介词宾语时不可用that，只可用which或whom引导从句，并且不可省略，但当介词位于宾语从句句末时，作为介词宾语的关系代词仍可用that，也可省略。T his is one of those things with which we have to put up、 This is one of those things (which\\that)
we have to put up with、3)引导定语从句的关系副词有when,where,why等。关系副词在从句中作状语，意义上相当于一个“介词+which”的结构。E ven in comic books where(=in which)
there are no words,the stories are fully expressed through the drawings、 No one knows the reason why(=for which)
he was so angry that day、 *非限制性定语从句 非限制性定语从句既可修饰先行词，也可修饰整个主句，起补充说明作用，与主句之间有逗号隔开，若省去，原句意思不受影响。不可用that引导非限制性定语从句。关系词不可省略。E very object has a gravitational pull,which is rather like
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magnetism、 *“介词+which\\whom\\whose”引导的定语从句 “介词+which\\whom\\whose”可引导限制性定语从句，也可引导非限制性定语从句，该结构中介词的选择取决于从句谓语动词的固定搭配，或先行词的习惯搭配。T his is the computer on which he spent all his savings It is written by a person with whom we are all familiar、 *as引导的定语从句 as引导的定语从句主要用于“such、、、as”及“the same、、、as”的结构中，代替先行词是人或物的名词。as引导非限制性定语从句时，代替整个主句，从句可位于主句之前、之后或中间。T hese are not such problems as can be easily solved、(as代替先行词problems)
As is mentioned above,no single company or group can control what happens on the Internet、(as代替主语)
2、主语从句1）主语从句可直接位于主语的位置，如果从句较长，谓语又较短，可用it作形式主语，而将从句放在句末。常见的句型有：
*It is a fact\\a pity\\a question\\good news that、、、 *It seems\\appears\\happened\\has turned out that、、、 *It is clear\\important\\likely\\possible that、、、 *It is said\\reported\\estimated\\has been proved that、、、 It is said that comic books create a connection between people of the same generation、 It seems that the performance is
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very useful、2)what引导的主语从句表示“、、、的东西时”，一般不用it作形式主语。W hat we lack is experience、3)what,who,when,why,whether等词含有各自的疑问意义，但它们引导的主语从句，都用陈述语序。H ow the plan is to be carried out should be discussed again、 I did know why I felt like crying、
3、宾语从句1）宾语从句可位于及物动词、介词和某些形容词后。连词that常可省略。介词后一般接疑问词引导的宾语从句。in that(因为),except that(除了),but that(只是）已构成固定搭配，其他介词后一般不接that引导的宾语从句。*I promised that I would change the situation、 *All this is different from what American young people would say about friendship、 *He is certain that watching so much television is not good for children、 *This article is well-written except that it is a bit too long、2）关于宾语从句连词的选择：1 若从句来源于一个陈述句,那么,连词用that,在口语中that可以省略;2 若从句来源于一个一般疑问句,连词则用if 或whether;3 若从句来源于一个特殊疑问句,则连词就是疑问词(如 what,who,where,when等)*They believe that the computer will finally take the place of human beings、(他们相信计算机终将代替人类。)
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(从句本来就是陈述句)* I wonder whether I should say something for him to the headmaster、 (我不知道是不是该为他在校长跟前说点什么。)
(从句来源于一般问句Shall I say something for him to the headmaster?)
*He asked me where he could get such medicine、 (他问我在哪儿能搞到那样的药。)
(从句来源于特殊问句Where can he get such medicine? )3)宾语从句后如有宾补，要用形式宾语it来代替，而把宾语从句移至宾补之后。H e has made it clear that he would not change his mind、4)在think,believe,suppose,expect等动词后的宾语从句中，如果谓语是否定的，一般将否定词移至主句谓语上，宾语从句则变成肯定形式。H e didnt think that the money was well spent、
4、表语从句 在句子中作连系动词的表语的从句,它位于主句中的系动词之后。表语从句出现在结构为“主语+系动词+表语从句”的句子中。表语从句除可用
that,what,when,why,whether,how等引导外，还可由because,as if(though)等引导。that常可省略。如主句主语为reason,只能用that引导表语从句，不可用because、 *Perhaps the most important thing to remember is that there is no one common type of life in America、 *The reason why so many
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英语中六大从句用法总结
