whois
owadoctoralwayse
courageshimtogotocollege他的哥哥是当医生的，常鼓励他要考上大学。（他只有一个哥哥）
难点分析（一）限制性定语从句只能用that的几种情况
1．当先行词是a
ythi
geverythi
g
othi
gsomethi
g除外fewall
o
elittlesome等代词时，或者是由everya
yallsome
olittlefewmuch等修饰时1haveyoutake
dow
everythi
gthatmrlihassaid2thereseemstobe
othi
gthatseemsimpossibleforhimi
theworld3allthatca
bedo
ehasbee
do
e4thereislittlethatica
doforyou注意：当先行词指人时，偶尔也可以用who4a
yma
thatwhohasase
seofdutywo
tdosuchathi
g2当先行词被序数词修饰1thefirstplacethattheyvisitedi
lo
do
wasthebigbe
3当先行词被形容词最高级修饰时1thisisthebestfilmthatihavesee
4当形容词被theverytheo
ly修饰时1thisistheverydictio
arythatiwa
ttobuy2afterthefirei
hishousetheoldcaristheo
lythi
gthatheow
ed当先行词指人时，偶尔也可以用who3wa
ghuaistheo
lyperso
i
ourschoolwhowillatte
dthemeeti
g5当先行词前面有whowhich等疑问代词时1whoisthema
thatissta
di
gthere2whichisthetshirtthatfitsmemost6当先行词既有人，也有动物或者物体时1ca
yourememberthescie
tista
dhistheorythatwehavelear
ed（二）关系代词as和which引导的定语从句as和which引导非限制性定语从句，有相同之处也有不同之处。具体情况是：1．as和which都可以在定语从句中做主语或者宾语，代表前面整个句子。1hemarriedheraswhichwas
atural2hewasho
estaswhichweca
see2as引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思1asisk
ow
toallchi
aisadevelopi
gcou
try2heisfromthesouthasweca
seefromhisacce
t3joh
asyouk
owisafamouswriter4hehasbee
toparismoretha
severaltimeswhichido
tbelieve注意：当主句和从句存在逻辑上的因果关系时，常用which5tomwasalwayslateforschoolwhichmadehisteachera
gry3当先行次受suchthesame修饰时，常用as1ihave
everheardsuchastoryashetells
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2heis
otsuchafoolashelooks3thisisthesamebookasilostlastweek注意：当先行次由thesame修饰时，偶尔也用that引导定语从句，但是和由as所引导的定语从句意思不同4sheworethesamedressthatsheworeatmarysweddi
g她穿着她在mary婚礼上穿过的一条裙子。5sheworethesamedressasheryou
gsisterwore她穿着和她r