（1)当先行词为人称代词he,she,they或anyone,nobody等指人的不定代词时。He who plays a trick must be prepared to take a joke.玩花招的人必定会受到戏弄。
Captain Fawcett’s first passenger was a doctor and the doctor flew from Birmingham to a lonely village in the Welsh mountains.
在介词+关系代词结构中，在介词前面可以加代词，名词，数词，形容词的比较级，最高级，短语等。This is the school in which I taught for 30 years. 这就是我教了30年书的学校。
The old woman， who lives on her own， has a cat for company.Lori is going to marry Mark， whom she does not love.
问:茶最先由中国人发现，它是中国人生活中不可或缺的部分。但是可以巧妙地修改成Tea， which is an indispensable part in Chinese people’s life， was originally discovered by Chinese. 这样就把which非限制性定语从句作为插入成分，既符合语法规则，也显得自己水平很厉害。
