定语从句是高中英语语法的重点,它在句子中出现的频率很高,尤其是在长句和比较难理解的句子中出现的就更多。要想正确地理解一个句子,分清句中的主句和从句很重要。定语从句按与先行词的密切程度可分为:限制性定语从句和非限制性定语从句; The attributive clause is the focus of high school English grammar. It appears frequently in sentences, especially in long sentences and difficult to understand sentences. To understand a sentence correctly, it is important to distinguish between the main sentence and the clause in the sentence. The closeness of the attributive clause with the antecedent can be divided into: the restrictive attributive clause and the non-restrictive attributive clause;