Do you want a friend whom you could tell everything to?这一句中的to提前会变成什么样的句子,为什么to提前了引导词就只能用whom.和原句区别在哪?

问题描述:

Do you want a friend whom you could tell everything to?
这一句中的to提前会变成什么样的句子,为什么to提前了引导词就只能用whom.和原句区别在哪?