去动词短语的意义，所以不可把介词置于关系代词前。
My younger brother, after whom I have to look, is demanding. ×
My younger brother, whom I have to look after, is demanding. √
我得照看我的小弟弟，真是让人费神。
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VI
关系词的省略 1.
关系代词的省略 1
）关系代词在从句中作动词宾语时可省略。
I have never regretted the decision (that/which) I made years ago.
我从来没为我几年前作出的决定感到后悔。
四维教育
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高中英语语法知识点详解（定语从句） 8
I have been to the city twice (that/ which) you just visited.
你刚参观完的那座城市我去过两次。 2
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