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(5) 当先行词有较长的后置定语或在被分割的定语从句中时, 用who不用that。 Professor Smith is coming soon who will give us a talk on how to learn English. 史密斯教授不久就要来给我们作一场关于如何学英语的讲座。 4. of whom, of which与whose的用法解析。 (1) whose的用法 ① whose引导定语从句, 后应紧跟名词, 构成名词短语。 The boy, whose father is an engineer, studies very hard. 那位小男孩学习很努力, 他的父亲是位工程师。 ② whose引导定语从句时, 先行词既可指人, 也可指物。 The bicycle, whose brake was damaged, has now been repaired. 那辆自行车的闸坏了, 现在已修好了。 ③ whose在定语从句中与它所修饰的名词一起可作介词宾语, 可以与介词一起放在先行词与从句之间。在whose引导的定语从句中, 可用of which代替whose, 但词序不同, 即“whose＋名词＝the＋名词＋of＋which”；而用of whom代替时只能指人, 有时可以与whose互换。 The boss, in whose factory Mary's father once worked, is kind to her. 老板对玛丽很好, 玛丽的父亲曾经在他的工厂工作过。 He lives in the room whose window (the window of which) faces south. 他住在窗户朝南的房间里。 (2) 下列情况只用of which或of whom, | 
