一、介词与先行词搭配的定语从句？
This is the playground on which we play football everyday.这个句子就是介词与先行词搭配的定语从句。
介词on加关系代词位置在从句里作地点状语。
关系代词指代先行词playground。
这词加关系代词可以换成关系副词。
这个句子可以改写成This is the playground where we play football everyday.
二、介词加whom的例子？
①
However, Fredrick William I, to whom the Amber Room belonged, decided not to keep it.（人教版高中英语第二册 unit1）
介词加whom是定语从句的一种形式，它用在定语从句中使得主句与从句关系紧密。
另外，which前也可以加介词
例如：The lecture in which the boy was interested will be conducted next week. 那孩子感兴趣的讲座下周举行
which与whom的区别在于先行词是指人还是指事物，人用whom 事物用which
②
1、This the hero of whom we are proud .这就是我们引以为荣的英雄.
2、We questioned the pilot，from whom we learnt that no other planes had been seen．
3、The author with whom all of us are familiar will visit our compa-ny．
4、In all there are 5609 students in our school,most of whom are bvetween 15 and 18.
③
In the dark street，there was not a single person to whom she could turn for help.
三、后置定语的句子？
介词短语可以做后置定语。
如The girl under the tree is my sisiter.这个句子中 under the tree 就是girl的后置定语。
四、with短语作后置定语的用法？
在英语中，with是一个介词，介词后面跟名词、动名词和宾格代词，介词和后面跟的词构成介词短语。介词短语可以作定语，修饰名词，with短语放在被修饰名词之后，如：
China is a very big country with a long history.
Tom has bought a beautiful house with a garden in the yard.
