精选优质文档-倾情为你奉上八、状语从句A. 时间状语从句1.when：当时；突然 I was walking along the street when someone patted me on the shoulder.2.while：在期间，接延续性动词，多接过去进行时 While it was raining，they went out3.as：一边一边，一就 She dances as she sings./ Just as he caught the worm,he carried outwhen，while，as都可以接延续动词，这时三者可以互换，as更强调动作先后或同时发生My father fall asleep while/when/as I was watching TV.When/As you leave，please take a raincoat with you.（不能用while）4.before：在之前，主将从现，主句过去时或过去完成时，从句用一般过去时 They had
