英语句子语法问题the table illutrates the changes in the extent to wh

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英语句子语法问题
the table illutrates the changes in the extent to which residents of a city were satisfied with their lives.
为什么which 前有个to,什么用法?把to去掉不行吗?
经常看到从句前有个介词出现,比如 of which,to which,in which,in where等等.怎么判断和如何使用是否在引导词前加介词?
还有一个例子
the figures for other aspexts of life saw a decline in 2010,by which time public transport had become the main problem.
出现了by

定语从句加在关系词加介词通常要看固定词组和表达的意思,加这个介词的方法组要有：
1,介词与先行词组成词组,如句1中的 to which,which指代extent 程度,to some extent/degree 是词组
同样的,句二中的by which 也是同样的原则,which 指代 2010 ,by which ：到.为止；
2,介词与定语从句中的谓语动词组词搭配或者词组；常见的有,
He is the man ,to whom we usually turn for help；中to whom 中的 to 与从句的turn组成搭配；
相对而言,第一种比较灵活,第二种相对简单一些,只要平时多留意,应该不是很难.

英语句子语法问题the table illutrates the changes in the extent to wh to the extent是什么意思这个句子语法是什么?The dogmaticism is to some extent necessary. the changes to 和the changes in 什么区别书上有the changes to Sunshi 英语翻译Although time course appears to dictate the extent to wh "to the extent not written 请问the extent to which... determining the extent to which 初中生英语作文 The Changes in Hometown The Changes in mg hometown 英语作文英语作文：The Changes in My Hometown 英语作文《The changes in my hometown》