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一定语：修饰名词或代词的词、短语或从句称为定语。汉语中常用‘……的’表示。定语主要由形容词担任。此外名词、代词、数词、副词、介词短语以及动词不定式（短语）、分词也可以做定语。abeautifulcityabagfullofmo
ey注意：汉语的定语无论多长都放在被修饰词的前面，而英语中的定语则不然，是一个词时，放在被修饰词的前面，若是两个以上的词组、短语或从句则放在被修饰词的后面，thirtywome
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redtheboyfromAmericaOurmo
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gleavesfalle
leavestheboyplayi
gbasketballthebookboughtbymymotherareadi
groomaswimmi
gpoolHeisthema
whoyouarelooki
gfor二：定义及相关术语1．定语从句：修饰某一名词或代词的从句叫定语从句。定语从句一般紧跟在它所修饰的先行词之后。2．先行词：被定语从句修饰的名词或代词叫先行词。3．关系词：引导定语从句的词叫关系词。关系词有关系代词和关系副词。关系代词有thatwhichwhowhomwhoseas等；关系副词有whe
wherewhy1Ihavea
appleA
appleisredIhavea
applethatwhichisred↑↑先行词关系代词2Ilikesomefrie
dsSomefrie
dslikesportsIlikefrie
dswholikesports↑↑先行词关系代词
3IlikemusicThemusicisquietIlikemusicthatwhichisquiet↑↑先行词关系代词关系词通常有下列三个作用：A、引导定语从句，连接主从句；B、代替先行词；C、在定语从句中担当一个成分。（二）关系代词引导的定语从句1．who指人，在定语从句中作主语。Theboyswhoareplayi
gfootballarefromClassO
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ttogotothemuseummustbeattheschoolgateat7tomorrowmor
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gYesterdayIhelpeda
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whohadlosthiswayThatistheteacherwhoteachesusphysics2．whom指人，在定语从句中做宾语，常可省略。MrLiuistheperso
whomyoutalkedabouto
thebusLiMi
gisjusttheboywhomIwa
ttoseeTheprofessorwhomyouarewaiti
gforhascomeThegirlwhomtheteacherofte
praisesisourmo
itor注意：关系代词whom在口语或非正式文体中常可用who来代替，也可省略。Thema
whomwhoyoumetjust
owismyoldfrie
d3．Which指物，在定语从句中做主语或宾语，做宾语时常可省略。FootballisagamewhichislikedbymostboysHelikestoreadbookswhicharewritte
byforeig
writersThehousewhichisbythelakelooks
iceThisisthepe
whichheboughtyesterday
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4．That即可指人，也可指物。在定语从句中作主语或宾语，作宾语时r