Simone问题补充说明：什么是先行词
1、先行词指人时，引导词可用Who,Whom,及that,其中当引导词在句中作主语时用Who或that；当其充当宾语时用whom或tha360问答t，在非正式宾语中也可用who，也可省略。
aThatboywho/thatbrokethewindowiscalledTom.
bThepersontowhomyoujusttalkedisMrLi.
b句可改为：Theperson(that/wh验真认套别副超前力祖om/who)yo封析试确封ujusttalkedtoisMrLi.
2、先行词指物时，引导词用that或which
a.Theyplantedthetreeswhichdidn’t县价卷伟说频响冲据needmuchwater.
b若进族写找理鲁负证看.Thefish(which)weboughtw史少倒磁但多百死erenotfresh.
3、先行词指时间时，引导词用When/onwhich或inwhich
a.Istillre在失片百施十弱配验太memberthedaywhen/onwhichIfirstcametoBeijing.
b.I'llneverforgettheyearwhen/onwhichweworkedonthefarm.
4、先行词指地点时，引导词用Where或inwhich
Thisistheho适usewhere/inwhichwelivedl修富药居诉思astyear.
或:Thisisthehousethat/whichwelivedin厚考脱真lastyear.
5、w述数翻务学害伯给紧左hose在定语从句素临绍面建府稳中作定语时，可用来指人，也可以用来指物，如:
a.Thisistheboywhosemotherdiedamont线情夜率hago.
b.Thi父限衣快sisthehousewhosewindowswerebro仅州ken.此句可改成：
T货够解鲜文友引hisisthehousethewindouesofwhichwerebroken.
6、先行词表示原因时，引导词用why,如:
Thereasonwhyhewaslateforschoolwasthatheha战简令dbeenknockeddownbyabike.
二、物殊情况：
尽管有以上基本原则，但要学好定语从句更应注意民抓照烧天养积车源以下特殊情况；
Ⅰ、当定语从句的先行词为表示人的不定代词，如anyone,anybody,everyone,everybody,noone,nobody,all，these，those等时,用who而不用that
Thosewhobreaktherulearepulished.
Anybodywhohadeyescouldseetheelephantwaslikeasnake.
Ⅱ.以who或which作主语的特殊疑问句中先行词指人，引导词只用That,如:
a.Whoisthepersonthatisstandingatthegate?
b.WhichofyouthatknowssomethingaboutEnglishdoesn’tknowthisword?
Ⅲ、先行词指物时引导词用that而不用which的情况:
1、先行词有序数词或形容词最高级修饰时，
ThisisthebestcompositionthathasbeenwritteninEnglish.
2、先行词是all,something,anything,nothing,everything,little,few,much等不定代词时
Thereisnothing/little/muchthatwecandoforher.
3、先行词被all,every,no,some,any,little,much等修饰时
I’vereadallthebooksthatyougaveme.
4、先行词被theonly/very等修饰时
Thisisthevery/lastplacethattheyvisitedyesterday.
5、有两个以上先行词，分别表示人或物时
Theytalkedabouttheteachersandtheschoolsthattheyhadvisited.
6、先行词为基数时
YesterdayIcaughttwofish,Nowyoucanseethetwothatarestillaliveinabasinofwater.
Ⅳ.time为先行词时，前边如有序数词修饰时，定语从句引导词用that或什么也不用，如没序数词修饰时，用when或that均可
a.Thisisthelasttime(that)Ishallgiveyoualesson.
先行词指人时，引导词可用Who,Whom,及that,其中当引导词在句中作主语时用Who或that；当其充当宾语时用whom或that，在非正式宾语中也可用who，也可省略。
aThatboywho/thatbrokethewindowiscalledTom.
bThepersontowhomyoujusttalkedisMrLi.
b句可改为：Theperson(that/whom/who)youjusttalkedtoisMrLi.
2、先行词指物时，引导词用that或which
a.Theyplantedthetreeswhichdidn’tneedmuchwater.
b.Thefish(which)weboughtwerenotfresh.
3、先行词指时间时，引导词用When/onwhich或inwhich
a.Istillrememberthedaywhen/onwhichIfirstcametoBeijing.
b.I'llneverforgettheyearwhen/onwhichweworkedonthefarm.
4、先行词指地点时，引导词用Where或inwhich
Thisisthehousewhere/inwhichwelivedlastyear.
或:Thisisthehousethat/whichwelivedinlastyear.
5、whose在定语从句中作定语时，可用来指人，也可以用来指物，如:
a.Thisistheboywhosemotherdiedamonthago.
b.Thisisthehousewhosewindowswerebroken.此句可改成：
Thisisthehousethewindouesofwhichwerebroken.
6、先行词表示原因时，引导词用why,如:
Thereasonwhyhewaslateforschoolwasthathehadbeenknockeddownbyabike.
