Question

关语从句This is one class you don't fall asleep in 1:you don't f

Answer 1

This is one class you don't fall asleep in

可以变为两个简单句：

This is one class,

In the class you don't fall asleep.

所以：

1.you don't fall asleep in是定语从句

2.省略掉的关系代词是that /which 在从句作in 的宾语

最后那个in 不能省略.理由从上面第二个句子可以看出来.从原句分析：

this （主语）is（连系动词） one class （表语）（相当于省略引导词 that,因为 that/which 在定语从句中做介词的宾语）you do not fall asleep in

3.这类从句用来修饰（名词）和（代词）