57 who，whom，which 和 what 作介词宾语

A who，whom

在正规英语中我们用介词 + whom 结构：

With whom did you go？

你和谁一起去的？

To whom were you speaking？

你刚才在跟谁说话？

但在日常口语中我们常把介词置于句末。这时一般将 whom 变成 who：

Who did you go with？

Who were you speaking to？

B which，what

在正规英语中我们用介词 + which/what 结构：

To which address did you send it？

你把东西寄到哪个地址去了？

On what do you base your theory？

你的理论依据是什么？

在非正规英语中我们将介词置于句末：

Which address did you send it to？

What do you base your theory on？