.关于定语从句(The Attributive Clause)在含有主句和从句的复合句中,用来修饰主句中的某一名词或代词的从句叫定语从句。它所修饰的词叫先行词。定语从句跟在先行词的后面。引导定语从句的词叫关系代词(that /which /who /whom /whose等)或关系副词(when / where/why等)。关系代词或关系副词放在先行词和定语从句之间起联系的作用,同时又充当定语从句中的一个成分,即从句中主语或宾语或状语。初中阶段主要初步学习由关系代词引导的定语从句。例一:This is the pen that (which) he is looking for .例二:Did you see the person who (that) stole the necklace ?关系代词的功能及选择关系代词的选择取决于两点:一是先行词是人还是物;二是关系代词在从句中作主语还是作宾语。1、 当先行词是人时,关系代词可用who或者that ; 当先行词是物时,关系代词可用which或者 that 。例三:The boy who (that) i