今天我们来分析下面这个病句：
The bike and its rider who had run over an old man were taken to the police station.
首先，我们来看这个句子的意思。这句话要表示的意思是――撞到那位老人的车和人都被带到了派出所。
接下来，我们分析这个句子的结构。总的看来，这是一个含有定语从句的复合句。主语是：the bike and its rider(单车和汽车的人)，谓语是were taken to the police station。在主语和谓语中间的who had run over an old man是定语从句修饰先行词bike和rider。
一个定语从句同时修饰2个先行词。在这句话中，bike是指代物，而rider是指代人，两者在定语从句中都做主语，指代“人”的关系代词可以用“that”或者是“who”，指代“物”的关系代词可以用“which”或者是“that”。那么这里又有人又有物，我们就要选择that，而我们的病句中使用的是who。
因此，我们今天分析的病句的正确表述为：
The bike and its rider that had run over an old man were taken to the police station.
