首先,这句话有问题。He often sat in a small bar drinking considerably more than (这里少了一个what)was good for his health. 其次,than并不能作定语从句的关系词,本句话中没有定语从句存在。 第三,本句话的句子结构为:He(主语) often sat (谓语动词)in a small bar(地点状语) drinking considerably more than what was good for his health(非谓语动词作状语)追问