介词+关系代词有：for+whom、for+which、in+which、at+which、on+which等。
例如：
Look，there comes Tom，for whom I have waiting for an hour。
瞧，汤姆来啦，我等他等了一个小时。
Last Saturday evening，I went to Wu Dong’s birthday party in which I met a foreigner named Jim。
上周星期六的晚上我去参加了吴东的生日聚会，在会上我会到了一个叫吉姆的外国人。
She came into the house，on whose wall there was a portrait of Einstein。她进入了房间，房子的墙壁上有一张爱因斯坦的画像。
注意事项
有时，前面的介词可移到定语从句的中间或后面，此时whom可用who，that代替；which可以用that代替。而且who, whom, which, that都可省略。如：
The man with whom you talked just now is our manager. —The man who you talked with just now is our manager.
你刚才与他谈话的那个人就是我们的经理。
He handed me a pen, with which I wrote down my address for him. —He handed me a pen, which I wrote down my address with for him.
他递给我一支钢笔，我就用那支钢笔给他写下了我的地址。
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