when 在英语中作连词的使用频率很高,用法很多。现就中学教材中出现的 when 作连词的用法归纳如下。一、当 when 引导时间状语从句时,它可表示从句的动作与主句的动作同时进行,也可表示两者一前一后分别发生。When 可译为“当…… When used as a conjunction in English, it is frequently used and used in many ways. The usage of conjunctions in when appearing in middle school textbooks is summarized below. First, when when advancing the adverbial clause, it can mean that the action of the clause is performed simultaneously with the action of the main sentence, and it can also mean that the two occur separately from each other. When can be translated as "When...