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从句可分为定语从句、状语从句和名词性从句，它们是中学阶段的重要语法项目。定语从句是形容词性从句，相当于形容词的用法，其功能是修饰先行词，对其性质、特征进行描述，先行词在定语从句中一般充当主语、宾语、表语、定语或状语等。状语从句是副词性从句，相当于副词的用法，其功能是在复合句中作状语。根据状语从句的含义，状语从句一般可以充当时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。名词性从句的功能相当于名词词组，一般在句子中充当主语、表语、宾语或同位语。三大从句的考查历年都是高考的重点，关联词的选择是高考的主要考点，定语从句中对which的考查，宾语从句中对what和that的考查，让步、时间和条件状语从句的考查是重中之重。 一、三大从句的区别 三大从句存在一定的关联性，应抓住关键点，确定是何从句。试比较： ①It is known to all that the moon travels around the earth.(主语从句) As is known to all, the moon travels around the earth.(定语从句) What is known to all is that the moon travels around the earth.(主语从句与表语从句) ②The news (that/which) they won the match is true.(同位语从句) The news that you told me yesterday is true. (定语从句) | 
