英语八大从句类型及其例句如下：

主语从句

例句：What you said is true.

宾语从句

例句：I wonder if you can help me.

表语从句

例句：This is what I want to do.

定语从句

例句：The book that I borrowed from the library is very interesting.

状语从句

例句：I will call you when I arrive.

同位语从句

例句：The news that she won the prize surprised us all.

比较从句

例句：She is taller than her sister.

关系从句

例句：The man who lives next door is a doctor.

这些从句在英语中非常常见，掌握它们的用法和结构对于提高英语写作和阅读理解能力非常重要。