定语从句中的介词,怎样分析关系代词前的介词是由关系从句中的谓语词组决定还是由从句前的先行词确定?例如：1、The goals (for) which he had fought all his life are quite important to him.2、It is useful to be able to predict the extent (to) which a price change will affect supply and demand.这两句话中括号里的介词都是由什么决定的,怎样分辨定语从句中关系代词前的介词是由什么决定的.
问题描述：
定语从句中的介词,怎样分析关系代词前的介词是由关系从句中的谓语词组决定还是由从句前的先行词确定?
例如：1、The goals (for) which he had fought all his life are quite important to him.
2、It is useful to be able to predict the extent (to) which a price change will affect supply and demand.这两句话中括号里的介词都是由什么决定的,怎样分辨定语从句中关系代词前的介词是由什么决定的.
答