一、定语从句的概念和其先行词及关系词在复合句中修饰名词或代词的从句叫作定语从句。被定语从句修饰的名词或代词叫作先行词。定语从句一般放在先行词的后面起限定作用。例如: First, the concept of attributive clause and its antecedent and related words in the compound sentence modification noun or pronoun clause is called attributive clause. Nouns or pronouns that are modified by attributive clauses are called antecedents. Attributive clause generally on the back of the antecedent to play a limited role. E.g: