英语中的从句主要分为三大类，具体包括：

名词性从句

主语从句：在句子中起主语作用的从句。例如：What you said is important.

宾语从句：在句子中起宾语作用的从句。例如：I told him that I would help him.

表语从句：在句子中起表语作用的从句。例如：The problem is how to solve it.

同位语从句：用来进一步解释或说明前面的名词。例如：The fact that he has won the prize is amazing.

形容词性从句

定语从句：用来修饰名词或代词，通常放在被修饰的词后面。例如：The book which is on the table is mine.

副词性从句

状语从句：用来修饰动词、形容词或其他副词，通常放在被修饰的词后面。例如：

时间状语从句：When I was young, if it rains, etc.

地点状语从句：Wherever he goes, etc.

原因状语从句：Because he is tired, etc.

条件状语从句：If he were rich, etc.

目的状语从句：So that he could, etc.

结果状语从句：So...that, such...that, etc.

让步状语从句：Though, although, etc.

这些从句在英语中非常常见，掌握它们对于提高英语写作和阅读理解能力非常重要。希望这些信息对你有所帮助。