英语有疑问He is the students to whom we want to talk.(为什么要用to who

He is the students to whom we want to talk.(为什么要用to whom?原句talk后面没有介词的,为什么可以自己加一个to呢?)因为to是跟talk搭配的,和谁交谈的意思.
The reason why/for which he refused the invitation is not clear.(这里又为什么可以加一个for呢?原句也是没有介词的)这里for which 就等于why,什么什么的原因.which不能单独引导原因状语从句,所以要加for表示什么什么的原因.
From the year when/in which he was going to school ,he began to know what he wanted be grew up.(同上)这句跟上一句基本一个道理,when 和in which是一样的意思.为什么要加in呢,表示在这一年里.
John married Alice ten years ago.(不应该用married to吗?什么时候用married,什么时候用married to?) marry是实义动词,不加介词也可以的.

He is the students to whom we want to talk
(talk to thom,而不是talk whom ,所以要补充介词)
下句一样道理.原句虽然没有介词,但变成从句后要补加介词
marry的中文翻译
以下结果由译典通提供词典解释
及物动词 vt.
1.娶;嫁,和...结婚
He is going to ...