精选优质文档-倾情为你奉上高考英语语法专题讲解-定语从句 、同位语从句 、强调句1. 定语从句1.1 三步思考:(1)找出先行词;(2)看先行词在定语从句中的语法功能(做主语、宾语或状语);(3)选择合适的关联词。1.2何时用that ?何时用which?1.2.1只能用 that 的3种情况:(1)先行词被序数词最高级,以及the only 、the very the same、the last修饰过.(2)先行词为all 、everything、nothing等不定代词.(3)先行词同时是人和物并列时. e.g. Later my father and Mr.Crosset talked of things and persons that they remembered in school. 1.2.2 只能用which的情况:(1)介宾短语(2)指代前面的一件事 e.g. He talked of it in a rude way which made me annoyed.1.3关系