2017年临沂市中考英语二轮专题复习材料语法17：定语从句 中考资讯导航：定语从句主要考查关系代词的选择。 一、定语从句（一）： 1.定语从句的概念：在复合句中，修饰某一名词或代词的从句叫定语从句。 2.先行词： 被定语从句修饰的名词或代词叫先行词。 3.关系词： 引导定语从句的连词叫关系词。如that、which、who、whom、whose、where、when等。 4.由that、which、who、whom、whose引导的定语从句。 二、定语从句（二） 1.先行词是物时，一般情况既可用that也可用which.但下列情况下，只能用that不用which。 1).当先行词为指物的不定代词，如all、everything、something、anything、nothing、none、the one等时，只能用that。 There is nothing ______ I can do for you . 2).当先行词被the only、the very 、the last、all、no、little等词修饰时，只能用that。 This is the very book ______ I’m looking for . 3).先行词被序数词修饰时，只能用that 。 This is the first nextbook ______ I studied in the middle school . 4).先行词为最高级或被最高级修饰时，只能用that。 This is the most beautiful mountain ______ I have ever seen .= I have _____ seen _____ a beautiful mountian . 5).先行词既有人也有物时，只能that 。 He told us many interesting things and persons _______ we had . 2.先行词是物时，一般情况既可用that也可用which.但下列情况下，只能用which不用that。 1).关系代词前有介词时，关系词只能用which 。 This is the building in ______ he lives . 2).先行词本身是that时，关系词只能用which 。 The clock is that _____ tells the time . 3).引导非限定性的定语从句（先行词是物且先行词与关系词用逗号隔开），关系词用which。 His book , ______ was lost last week , has been found now. 3.先行词是人时，一般情况下既可用who 也可用that 。但以下情况下，只能用who。 1).当先行词为those、one、ones、anyone且作主语时，一般用who 。 Those ______ are singing are all my classmates . 2).在there be 句型中，先行词指人时，只能用who。指物时用that。 There is a girl ______ expects to see you . 3).当先行词是I、you、he、they等时，只能用who 。 He ______ plays with fire gets burned .