什么时候介词不能放在句末

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这个问题一般在丁聪里面碰到的比较多（1）\x05当定语从句中含有介词,介词放在句末时,who,that,which可省略,但介词在关系代词前时,只能用“介词+which/whom”结构.例如：This is the house in which we lived last ye...
======以下答案可供参考======
供参考答案1:
不及物动词后面需将介词放置末尾+宾语
在及物动词后面就不用+了
供参考答案2:
当然可以的，一般常见在以下情况：
（定语从句中）
Where is the man whom you gave your ticket to?
Have you met the person whom he was speaking to?
She is the girl who(m) I’ve never heard of.
This is the question (which / that) we’ve had so much discussion about.
(疑问句中)
What do you want to talk about?
whom are you living with?
What job are you looking for?