连接两个分句时中间用逗号隔开,那么此时能用when还是while?

都可以,得根据具体情况具体分析.1、when用来引导表示时间点的时间状语从句, when 说明从句的动作和主句的动作可以是同时，也可以是先后发生；while用来引导时间段的从句, while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。 When the teacher came in, we were talking. While we were talking, the teacher came in. 2、由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while引导。The dog barked when it heard a noise.They were singing while we were dancing. 3、when和while 还可作并列连词。when表示“在那时”；while表示“而，却”，表对照关系。如： a. I will tell you when he arrives.b. He is strong while his brother is weak.