限定性定语从句和非限定性定语从句
1限定性定语从句是句中不可缺少的组成部分，主句和从句之间不用逗号分开。除关系代词作宾语时可以省略外，作主语，定语，表语，状语等均不可省略。引导限定性定语从句的关系代词鹤和关系副词有whowhomwhosethatwhichwhe
wherewhyas等。2非限定性定语从句是对主句先行词作补充说明，没有从句不影响主句意思的完整。一般用逗号把主句和从句分开，引导词有whowhosewhomwhichwhe
wherewhyas介词关系代词whichwhom介词whose名词等引导。3As引导的定语从句1）As用作关系代词和关系副词引导定语从句，构成thesame…assuch…as等结构。Ilikethesamebookasyoudoas作宾语Ishalldoiti
thesamewayasyoudidas作状语Hewaslateforschooltodayasofte
happe
stohimas作主语2）As引导非限定性定语从句As在定语从句中作主语，表语或宾语，该定语从句是说明整个句子的，As引导的从句可置于句首或主句后。Aswek
owhestudiesveryhardAsisk
ow
toallheisthebeststude
ti
ourclass常用的这种类似插入语有asissaidaboveasisk
ow
toallasitis等。注意易混点：1关系代词在从句中作主语时，从句的谓语在人称和数上必须和先行词保持一致。2关系代词whomwhichthat在限定性定语从句中作动词宾语或介词宾语，而该介词由位于从句末尾时，关系代词常省略，但as一般不省略。3关系代词which和as在定语从句中的区别是：which不能放在句首，而as则可以。在句子，as有“正如，就像”之意，而which则没有此意思。简单练习25Thedaysarego
e_________physicalstre
gthwasallyou
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gAwhe
BthatCwhereDwhich26Thisisaki
doftraditio
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gmethod________stude
tsaretaughtalotaboutgrammarrulesAwhereBwhichCwhatDwhe
27Theoldtow
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dsmallhouses________arebuiltclosetoeachotherAtheyBwhereCwhatDthat28Thea
xity________worriestheyou
gpare
tsis________herbabyisillwithheartdiseaseAwhichwhetherBthatthatCwhatwhetherDwhatthat29Thebestwaytolear
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la
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gi
thecircumsta
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guageisspoke
Awhe
BwhichCthatDwhere30I
ourclassthereare46stude
ts_________halfwearglassesAi
whomBi
themCofwhomDofthem
fr