定语从句定语从句（Attributive Clauses）通常皆放在它所修饰的名、代词之后，这种名、代词就叫做先行词。引导定语从句的关联词为关系代词和关系副词。1.关系代词引导的定语从句在下面几种情况下必须用关系代词that引导定语从句:(1) 先行词是不定代词all ,few, little, everything ,nothing anything, none等。如：Is there anything that you want to buy in the shop?你在商店里有什么东西要买吗？(2) 先行词被序数词或形容词最高级所修饰,或本身是序数词、基数词、形容词最高级。如：This is the best movie Ive ever seen.这是我看到过的最好的一部电影。(3) 先行词被all, any ,every ,each, few, little, no ,some等修饰时。如：I have read all the books(that )you gave me.我读了你给我的所有的书。(4) 先行词被the on
