英语时间状语从句状语从句1
时间状语从句(1)whenwhen用作并列连词(正在那时,突然)Wewereabouttostartwhenitbegantorain
IwaswatchingTVwhensomeoneknockedatthedoor
…onthepointofdoing…when…did………hadjustdonewhen……(2)asas与延续性动词连用,侧重两个动作伴随发生,其时态一致:Ashegrewolderhelostinterestineverythingexceptgardening
Wewerehavingbreakfastasshe________(watch)TV
(3)whilewhile“在……期间”,与延续性动词连用,和主句的动作同时发生,常用三种时态
WhileIwaswaitingatthebusstop,buseswentbyintheoppositedirection
Whileinprison,hewrotehisfirstnovel
Shoesweremendedwhileyouwaited
(4)before①before“在……之前”Ihadfinishedmypapersbeforemyteacherwentabroad
②before“过…时间之后才…”,注意使用___________和___________时态
Theyworkedlonghoursbeforeeverythingreturnedtonormal
恢复正常Itwillbealongtimebeforewefinishthisdictionary
③还没来得及ThebellrangoffbeforeIcouldanswerit
(5)assoonas“一…就…
”,directly,immediately,instantly;thein