定语从句定语从句在句中相当于一个形容词，起限定语的作用，修饰说明名词、代词或主语的全部内容。通常在被修饰的词语（即先行词）之后，由“关系词”引导。定语从句的三种功能：1连接功能：连接从句，连接主句和定语从句2语法功能：在定语从句中充当句子成分（主语、宾语、定语、状语）定语从句中的关系词分为关系代词和关系副词两种thatwhichwhowhomwhosewhe
wherewhy
关系
语
法指词代
主语
宾语（可省）
定语
状语
指人
whothat
whomthat
whose

时间、地点、原因
指物
whichthat
whichthat
whose
Wherewhe
why
注关系代词在句中充当主语、宾语，因此定语从句中不能再出现关系代词所替代的名词或代词。1关系代词在从句中作主语时不能省略①Apla
eisamachi
ewhichthatca
fly作主语Thedogwhichthatwaslosthasbee
fou
d作主语②The
umberofpeoplewhothatlosthomesreached250000Herecomesthegirlwhothatwa
tstoseeyou2关系代词在句中作宾语时可省略①The
oodlesthatwhichIcookedweredelicious（作宾语）ThisisthebookthatwhichIwa
ttoreadTheletterthatwhichIreceivedyesterdaywasfrommyfather②ThegirlwhothatwesawyesterdayisMaryMrLiisama
whomwhothatweshouldlearfromDoyouk
owthema
whomwhothatistalki
gto3关系代词在从句中做定语①The
ovelwhosecoverwasbroke
blo
gstome②He
eryistheboywhosemotherisourE
glishteacherThisistheperso
whosestorysurprisedeverybody4关系代词在句中作表语时可省略（只能用that）Sheis
otthegirlthatshewasIk
owtheperso
whosecompa
yproducescomputers
1
f定语从句中关系代词与关系副词的选择1明确关系代词，关系副词在定语从句中的不同作用关系代词whichthatwho在定语从句中作主语或在及物动词或介词后作宾语关系副词whe
wherewhy在定语从句中作状语，即定语从句中不缺主语、宾语，只缺时间、地点或原因状语2分析句子结构，明确句法成分关系词在从句中作宾语还是作状语，关键取决于从句中的谓语动词。如果定语从句中谓语动词是及物动词，应观察其后有无宾语。如果没宾语，则应考虑使用能充当宾语的关系代词which或that。如果句子中有宾语，就考虑关系副词whe
或where等关系副词（whe
wherewhy）
1
Whe
的用法（在定语从句中做时间状语）
Istillrememberthedaywhe
IfirstcametoBeiji
gWewill
everforgetthehappytimewhe
weworkedo
thefarmHecameatatimewhe
atwhichwe
eededhelp
2
where的用法（在定语从句中做地点状语）
ThisisthehousewherewelivedlastyearThefactorywherer