这句英语有语法错误吗？

Question

When it comes to the prediction of earthquakes, we should consider the time scale on which whether we can predict earthquakes or not depends.

主要是后半句 on which whether we can predict earthquakes or not depends

Answer 1

这句话没有问题，它的体现的语法现象主要有两个：

1 从句套从句， 定语从句的主语是主语从句

2 先行词是从句的宾语，并且前面有介词，需要把介词提前，也就是"depend on"里的on在移到从句最前面。

A ： We should consider the time scale 

B ： Whether we can predict earthquakes or not depends on the time scale.

C：  We should consider the time scale on which whether we can predict earthquakes or not depends.

B 句中的“Whether we can predict earthquakes or not” 是主语从句，是从句的主语，你可以把它直接看成一个名词就行。

This is the ring on which she spent 1000 dollars. 

这句话与原句的区别就是从句的主语是一个代词，而原句的从句主语是一个主语从句。