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(一)时间状语从句:1.引导词:a)when;while;as当……时候when既可跟短暂性动词也可跟延续性动词while跟延续性动词as多用于口语,强调“同一时间”或“一前一后”e,g:Thestudentsweretalkingintheclassroomwhentheteachercamein.=Whilethestudentsweretalkingintheclassroom,theteachercamein.Motheralwayssingsasshecooksdinnerforus.妈妈总是边给我们做饭边唱歌。b)until;not…untiluntil“直到……为止”，主句的谓语动词用延续性动词。not…until“直到……才”主句的谓语动词常用短暂性动词。e.g:Iwillstayhereuntiltherainstops.=Iwon’tleavehereuntiltherainstops.after在……之后;before在……之前;assoonas一……就……e.g:IwenttosleepafterIfinishedmyhomework..=IfinishedmyhomeworkbeforeIwenttosleep.Assoonasthebellrings,thestudentswillgointotheclassroom.2.时态:a)当主句为一般过去时时,从句常为过去的某种时态;e.g:Whilethestudentsweretalkingintheclassroom,theteachercamein.IwenttosleepafterIfinishedmyhomework..b)当主句为一般将来时时,从句为一般现在时e.g:Assoonasthebellrings,thestudentswillgointotheclassroom.Iwillstayhereuntiltherainstops(二)不定式作目的状语，修饰谓语动词，表行为的目的。Theyorganizeashowtoraisemoney.为了筹钱，他们组织了一场展示会。KellyarrivedattheairportearlytoseeMariaoff.凯丽早早地来到机场为玛丽亚送行。四、交际用语WouldyouliketocometoChinaforyourvacation?你想来中国度假吗？（表邀请）Would/Willyouhelpmeplanatrip?帮我计划一下旅行好吗？（表请求）Could/Canyoucomealongwithus?你能和我们在一起好吗？（表邀请或请求）Shouldwetakehimthere?我们带他们去那儿好吗？（表建议）HowabouttakinghimtotheMingTombs?带他去十三陵怎么样？（表建议）