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1、..定语从句请看下面的句子：Iwanttoknowtheboywhoisthetallest.句子做定语修饰boy（一）概念:定语从句：在复合句中修饰名词或代词的句子，叫定语从句。先行词：被定语从句修饰的词叫先行词。关系词：引导定语从句的词叫关系词。（二）定语从句的分类Ⅰ、限定性定语从句：从句不可少，没有它，先行词的意思不明确，主句也不完整。与先行词之间不用逗号。e.g:Thisisthebookthat/whichIwant.Ⅱ、非限定性定语从句：是对先行词的补充说明，没有它不会影响先行词或主句意思的完整
2、性。从句一般用逗号同主句分开。e.g:Mr.Green，whoiswatchingTV，ismyuncle.（三）(限定性)定语从句的结构Maryisagirlwhohaslonghair.先行词关系词定语从句关系代词关系副词which,who,whom,whose,thatwhere,when,why（四）定语从句的实质：二句合一（合并条件：人物先行在句一，又占句二一席地）Maryisagirl.合并为一个句子Shehaslonghair.思路：留（保留先行词）-----舍（舍去与先行词互指的词）----
3、替（用关系词代替舍去部分）Maryisagirlwho/thathaslonghair.请把下列句子二句合一1.Isawtheman.Heclosedthedoor2.Thegirlishappy.Shewontherace3.Themancalledthepolice.Hiswalletwasstolen...（五）定语从句关系词的确定:la.先行词的分类lb.先行词在从句中充当的成分1.先行词做主语人：who/that物：which/that2.先行词做宾语人：who/whom/that物：whi
4、ch/that3.先行词做定语人：whose物：whose/ofwhich4.先行词做状语：when,where,whylwho,whom,whose,that用法区别.lwho/that作定语从句的主语或宾语.Themanwho/thatisspeakingatthemeetingisaworker.做题思路：先分解——分析——再合并分解Themanisaworker.Themanisspeakingatthemeeting.作主语lWhom/that作定语从句的宾语Thewoman（whom/that)
5、theywantedtovisitisateacher.分解Thewomanisateacher.Theywantedtovisitthewoman.作宾语注意:关系代词作动词宾语时可省略.lwhose作定语从句的定语.Iknowthegirlwhosemotherisateacher.分解Iknowthegirl.Thegirl’smotherisateacher.作定语...小结：关系词判断步骤l首先，要辨别出先行词。如果先行词是指人,关系词可能就用who,thatwhom,whose。如果先行词指物,
6、关系词可能用which或thatl然后，要确定关系词在从句中的成分。请看下表先行词主语宾语定语人who,thatwho(m),thatwhose物which,thatwhich,thatwhose,ofwhich巩固练习：用适当代关系词填空1.Ihaveafriend________likeslisteningtoclassicalmusic.2.YesterdayEmilywaswearingthenewdress__________Igaveher.3.Theman______legbrokeinama
7、tchusedtobeafootballplayer.（六）只能用that,不能用which的情况：(1)先行词为all,everything，anything，nothing,something,nothing,few,little,much,theone等不定代词时；(2)先行词被形容词最高级所修饰或被theonly,thevery,thelast,any,few,little,no,all,oneof等修饰时：(3)先行词为数词或被序数词（含last)修饰时。（4）先行词是并列词组既有人又有物时。
8、(5)在以who,which开头的句子中为了避免重复。口诀：不定代词这一伙，全用that准没错先行词前有修饰，千万不能用which.请在以下例句中体会以上规则：1.HereissomethingthatIwilltellyou.2.Wehaven’tgotmuchthatwecanofferyou.3.Isittheonethatyouwant?4.Thisisthemostinterestingstorytha
