我们对 but 作为副词、连词和介词都十分熟悉,但对用作关系代词 but 的用法则较为生疏。先请看这样一个句子:There is no one but has his weak side.人皆有弱点。(直译:没有无弱点的人。)在这句中 but 含义是 that/who…not,是一个关系代词。but 作为关系代词只用在某些否定结构之后且只能引导限定性定语从句,多出现在书面语 We are very familiar with but as adverbs, conjunctions and prepositions, but the usage of but as a relational pronoun is rather strange. First look at such a sentence: There is no one but has his weak side. (Literal Translation: There are no weaknesses.) In this sentence but the meaning is that / who ... not, is a relational pronoun. but as a relational pronoun only after some negative structure and can only guide the qualified attributive clause, appear in written language