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连词主要有：when as while before after until as soon as since等 (1)区别when, as, while的用法 ①.when当......时候引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词,如： _________ the students heard the teachers footsteps, they all stopped talking. 当学生们听到老师的脚步声时，他们都停止了讲话。(从句动作发生在前) ② as当.......时候或一边.......一边引导的时间状语从句其动词的动作是延续性的，而且侧重表示主句和从句的动作并相发生： We were having breakfast __________ she was combing her hair. 她梳头时我们在吃早饭。 ③ while表示在某一段时间里或在期间，其所引导的从句的动作是延续性的，并侧重表示和主句的动作同时发生。如： I can learn ________ I work. 我可以边工作边学习。 用when, as, while填空： ________ you came in, I was talking with a few boys. It started to rain __________ we were playing outdoors. They talked _________ they walked down the river. __________ it was raining, the students were playing basketball. | 
