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when作连词引导状语从句时,通常用来表示时间。例如: When I went downstairs, they were eating breakfast.我下楼去的时候,他们正在吃早餐。(表示“当……时”)
When used as a conjunction to guide adverbial clauses, it is usually used to indicate time. For example: When I went downstairs, they were eating breakfast. When I went downstairs, they were eating breakfast. (It means “When...”)