高二英语语法状语从句解析高二英语语法状语从句解析一、时间状语从句表示时间的状语从句可由when，as，while，whenever，after，before，till（until），since，once，assoonas（或themoment），bythetime，nosooner……than，hardly（scarcely）……when，everytime等引导。e.g.WhenIcameintotheoffice，theteacherswerehavingameeting.Hestartedassoonashereceivedthenews.Onceyouseehim，youwillneverforgethim.NosoonerhadIgonetobedthanIwenttosleep.二、原因状语从句原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是because，since，as，nowthat（既然）等，for表示因果关系时（它引导的不是从句）为并列连词，语气不如because强。e.g.Heisdisappointedbecausehedidn‘tgettheposition.Asitisraining，Iwillnotgoout.Nowthatyoumentionit，Idoremember.三、地点状语从句引导地点状语从句的`连词是where和wherever等。e.g.Sitwhereveryoulike.Makeamarkwhereyouhaveaquestion.四、目的状语从句引导目的状语从句最常用的词（组）是so，sothat（从句谓语常有情态动词），inorderthat，incase（以防，以免）等。e.g.Speakclearly，sothattheymayunderstandyou.ShehasboughtthebookinorderthatshecouldfollowtheTVlessons.Heleftearlyincaseheshouldmissthetrain.五、结果状语从句结果状语从句是表示事态结果的从句，通常主句是原因，从句是结果。由sothat（从句谓语一般没有情态动词），so……that，such……that等引导。e.g.Shewasill，sothatshedidn’tattendthemeeting.Hewassoexcitedthathecouldnotsayaword.Sheissuchagoodteacherthateveryoneadmiresher.六、条件状语从句条件状语从句分真实性（有可能实现的事情）与非真实性（条件与事实相反或者在说话者看来不大可能实现的事情）条件句。引导条件状语从句的词（组）主要有if，unless，so（as）longas，onconditionthat，so（as）faras，ifonly（=if）。注意：条件从句中的if不能用whether替换。e.g.Ifheisnotintheoffice，hemustbeoutforlunch.Youmayborrowthebooksolongasyoukeepitclean.SofarasIknow（据我所知），hewillbeawayforthreemonths.Youcangoswimmingonconditionthat（=if）youdon‘tgotoofarawayfromtheriverbank.Ifhehadcomeafewminutesearlier，hecouldhaveseenher.七、让步状语从句让步状语从句可由although，though，as，evenif（though），however，whatever，whether……or，nomatterwho（when，what，……）等引导。注意：as引导的让步状语从句一般是倒装的。e.g.Thoughheisachild，heknowsalot.Childasheis，heknowsalot.Whatever（=Nomatterwhat）yousay，I’llneverchangemymind.八、方式状语从句方式状语从句常由as，asif（though），theway，ratherthan等引导。e.g.YoumustdotheexerciseasIshowyou.Heactedasifnothinghadhappened.九、比较状语从句比较状语从句常用than，so（as）……as，themore……themore等引导。e.g.Ihavemadealotmoremistakesthanyouhave.Hesmokescigarettesasexpensiveashecanafford.The