1、主从复合句中从句来表达一件事情 或一个行为发生的时间。引导词：When while before after as soon as until since 定义：when Whileasas soon asbeforeafteruntil和和tillnot .untilsince引引导导词词当当时候时候当当时候时候当当时候时候一一.就就在在之前之前在在之后之后直到直到.为止为止直到直到.才才自从自从when Whileasas soon asbeforeafteruntil和和tillnot.untilsinceIt was raining when she arrived at the st
2、ation.When you worked,I was sleeping.非延续性动词延续性动词whenI was doing homework while my father was watching TV.Dont make any noise while others are reading.while延续性动词延续性动词主句主句从句从句When当当的时候的时候过去进行时（过去进行时（was/were+v-ing)一般过去时（一般过去时（v-ed)一般过去时（一般过去时（v-ed)过去进行时过去进行时was/were+v-ingWhile当当的时候的时候一般过去时（一般过去时（v-ed)
3、过去进行时过去进行时 was/were+v-ingWhile同时同时过去进行时过去进行时（was/were+v-ing)过去进行时过去进行时was/were+v-ing用用when或或while填空填空1._ we were talking in the classroom,the teacher came in.2._ she came in,I was reading a book.3._ she was reading a book,the phone rang.4._ I saw the boy,he was wearing a new coat.5.Were you drawing
4、the teacher was talking?延续性动词非延续性动词延续性动词非延续性动词强调两个动作同时发生before 在在之之前前after 在在之后之后(主句的动作发生在从句动作之前主句的动作发生在从句动作之前)Before we begin dinner,my father gives thanks for the food.(主句的动作发生在从句动作之后主句的动作发生在从句动作之后)Mother prepares dinner after I come back from school.as soon as:一就 时态：主将从现时态：主将从现将来时将来时现在时现在时Iwillca
5、llyouassoonasIarriveinBeijing.until:直到/一直not.until:直到才I will wait until you finish all the work.Ididntgotobeduntil（till）myfathercameback.since“自从以来”IhavebeeninBeijingsinceyouleft.（since 常与现在完成时连用）1.Check what you have written _you hand in your application form.Asince Bbefore Cafter DWhile 2Jenny didnt go to bed her mother came home last night.Aas soon as BIf Cwhile Duntil 3.Miss Lin has taught us English _ Bwe came to this school.Aafter Bsince Cbefore DwhenBDBpractice
