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1、高中定语从句限定性定语从句：队先行词起修饰、限定作用 非限定性定语从句：对先行词进行补充说明，相当于一个并列句，用逗号把定语从句同先行词分开注：在非限定性定语从句中，关系代词which/as既可以代指前面的先行词，又可以代指前面的整个句子。:He told me the news,which I have known.He was ill in bed,which was konwn by us. ：非限定性定语从句中，如果由as引导，既可以把定从放后（主句），又可放前。:As was known by us,he was ill in bed. It was known by us that
2、 he was ill in bed. ：as在从句中出现时，从句常用被动结构。:He passed the exam,as is expected. ：as引导非限定从，仍然保持它的意义。 ：如果非限定从是否定句，常用which引导。:My teacher usually praises him in publics which I dont like. ：在非限定性定语从句中，所有限定性关系词都可以用。除that关系代词which：代物、事。能做主语、宾语 that：代人、代物 能做主语、宾语 who：代人，做主语/ whom：代人，做宾语 whose ：作定语，表所属关系 as：the
3、sameas同类异物/the samethat同类同物: I have a book whose cover is green.=I have a book the cover of which is green.关系副词（代指先行词在从句中作状语）when:where:why: I cant forget the daythat/which/ we spend together. when we studied hard. 限定性定语从句（Key Point）：当先行词是不定代词时(all、much、little、something、anything、everything、nothing、t
4、he one、none、no one)，只用that 不用which:You should hand in all that/ you have finished.:当先行词被不定代词修饰时，只用that 不用which:You should hand in all your work that/ you have finished.：当先行词前有any、few、only、little、no修饰，只用that 不用which:The only thing that we can do is to give you some advice.：当先行词被the only、the very、the
5、last、the same修饰，只用that 不用which:This is the very book that/ I wanna buy.：先行词被the+序数词/最高级 修饰时，只用that 不用which：先行词既有人(who/whom/that)又有物(which/that)，取“交集”，只能用that：当主语的主语是疑问词who或which的时候 只用that:Which is the bike that/ you paid 500 Yuan for?Who is the lady that won the gold medal?：当先行词在主句中作表语，而关系代词也在从句中作表语
6、时，只用that:Shanghai is no longer the small city that it is used to be.：“one of+名词复数”做先行词时，定语从句中谓语用复数。“the only one of+名词复数”做先行词时，定语从句中谓语用单数。：the way做先行词时，无论在从句中做主宾还是状语，关系词都用that/in which/:I dont like the way that/in which/ he talked with his mother.：It/Thisiswas+the+序数词+time+that have donehad done：当先行
7、词为situation、condition(条件)、occassion(场合)、case(案件)、point、stage(阶段)、activity做先行词时用where引导定语从句。:We have to face the situation where no one can live a happier life.：介词+关系代词=关系副词 介词+which=wherewhenwhy 介词+wherewhenwhy （为了表达更明确） 通常情况下只记from where: This is the mountain, from the peak of the mountain I can see the whole city.This is the mountain from (the peak of) which I can see the whole city.：介词+which=when 介词+which time（为了表达更明确）:Ill never forget the dayswhenduring whichduring which time(首选)we studied hard：these/those代指人做先行词时，用who不用that：当先行词指人，被形容词最高级修饰用that不用who
