初升高中英语暑假衔接材料：专题04 主从复合句（宾语从句、定语从句、状语从句考点全解析）（暑假复习讲义）（原卷版）

1/2专题04主从复合句宾语从句、定语从句、状语从句考点全解析考点序号考点聚焦考点一宾语从句考点二定语从句考点三状语从句脉脉｜络｜重｜构考考｜点｜精｜讲考点一宾语从句【知识精讲】宾语从句的定义宾语从句就是用一个完整的句子来充当主句动词（或介词）的宾语，说明“说了什么”、“想了什么”、“知道了什么”。位置：跟在及物动词（say,think,know,believe,wonder等）或介词（about,of,in等）之后。Iknowthatheishonest.（我知道他是诚实的。）→“他是诚实的”这个句子当了know的宾语。连接词从句类型连接词作用例句陈述句that只起连接作用，无词义，在句中不作成分，口语中常省略。Ihear

(that)hewillbebacksoon.一般疑问句if/whether表示“是否”，不作句子成分。Iwonder

if/whethershewillagree.特殊疑问句疑问词(what,when,where,why,how,who等)保留原疑问词的词义，并在从句中充当主语、宾语、状语等成分。Pleasetellme

whereyouare.

Idon‘tknow

whotookmybook.易错点拨1.【语序错误】受中文思维或直接疑问句影响，忘记用“主语+谓语”的陈述语序。❌CanyoutellmehowcanIgettothestation?✅CanyoutellmehowIcangettothestation?2.【时态误用】忽略“主过从过”原则或客观真理。主句过去时（said,thought,asked等），从句要用相应的过去时态。Hesaidhewastired.Shetoldmeshehadfinishedherwork.客观真理、科学事实、格言等，永远用一般现在时。Theteachersaidlight

travels

fasterthansound.（真理，用travels，不是traveled）3.【连接词混淆】if/whether与that混用。Whether和If都表“是否”，但If不能用于以下情况：介词后：Wetalkedaboutwhetherweshouldgo.(❌不能用if)后接ornot时：Idon‘tknowwhetherhewillcomeornot.(❌不能用if...ornot)引导主语/表语从句：Whetherhesucceedsisimportant.(❌不能用If)4.【否定转移】在think,believe,suppose等表示“认为”的动词后，如果宾语从句是否定意思，常将否定词not转移到主句谓语上。中文：我认为他不会来。英语：Idon’tthinkhewillcome.(更地道)5.【宾语从句的简化】当主从句主语一致时，宾语从句可简化为“疑问词+todo”结构。Idon’tknowwhatIshoulddo.=Idon’tknowwhattodo.Hewonderedhowhecouldgetthere.=Hewonderedhowtogetthere.【典例破题】1.Couldyoupleasetellme______?

A.whereisthenearestbank B.wherethenearestbankis

C.thenearestbankiswhere D.iswherethenearestbank2.Idon’tknow______hewilljoinus.We‘llbehappyifhecomes.

A.when B.why C.whether D.where【巩固提升】一、单项选择1．—Ithinkit’sdifficulttowritethebookreportintwodays.Ireallydon’tknow________.—Believeinyourself!Planyourtimeproperly,andyoucanmakeit.A．whyIhavetodoit B．whenwillIfinishitC．howcanIdoit D．whetherIcanfinishit2．—Let’sgoclimbingifit________nextSaturday.—Goodidea.Butnobodyknowsifit________.A．isfine;rains B．isfine;willrainC．willbefine;rains D．willbefine;willrain3．Iwonder________theSaharaDesertisthelargestdesertonEarth.A．that B．if C．what D．how4．Thereasonforhissuccessis________heworkedveryhard.A．why B．that C．whether D．how5．—ShallwelearnsomebasicbodylanguagebeforeourtriptoJapan?—Oh,itcanwait.Wedon’tknow________wewillreallyneeditornot.A．that B．when C．where D．whether6．Hehasn’tdecided________tostayinBeijingorgobackhome.A．if B．whether C．when D．where7．Ibelieve________youwillmakegreatprogressifyouworkhard.A．that B．if C．whether D．when8．Theyaretalkingabout________theywillholdasportsmeetingnextweek.A．if B．whether C．that D．what9．Hethinks________itiseasytolearnEnglishwell.A．that B．if C．whether D．what10．Wehope________youcanjoinusinthegame.A．that B．if C．whether D．when考点二定语从句【知识精讲】定语从句的定义定语从句也叫形容词性从句，用一个完整的句子来修饰名词或代词（这个被修饰的词叫“先行词”），说明“什么样的”、“哪一个”人或物。简单句：Ilikethebook.（我喜欢那本书。）→哪本书？定语从句：Ilikethebookthatmyteacherrecommended.（我喜欢我老师推荐的那本书。）→“我老师推荐的”这个句子修饰“book”。核心构成理解定语从句，关键在于掌握两个部分：1.先行词：被定语从句修饰的那个名词或代词。2.关系词：连接主句和定语从句的引导词，它一方面指代前面的先行词，另一方面在定语从句中充当主语、宾语或定语。关系词关系词指代在从句中作用是否可省略例句who人主语

或

宾语作宾语时可省Theman

whoistalking

ismyuncle.whom人宾语（常用在介词后）通常可省Thegirl

(whom)yousaw

isLily.that人或物主语

或

宾语作宾语时可省Thebook

thatisonthedesk

ismine.which物主语

或

宾语作宾语时可省Thecar

whichhebought

isred.whose人或物定语（表示“谁的”、“某物的”）不可省略Thisistheboy

whosefatherisapilot.易错点拨1.【只能用that的四大情况】必须用that，不能用which/who的情况：序/最：先行词被序数词或形容词最高级修饰时。Thisis

thefirst

movie

that

hasmovedmetotears.（第一部电影）Heis

themost

carefulperson

that

Iknow.（最细心的人）不：先行词是不定代词时，如：all,much,anything,everything,nothing,little,few等。Allthat

glittersisnotgold.（所有闪光的）Isthere

anythingthat

Icandoforyou?（任何事情）双：先行词既有人又有物时。Wetalkedabout

thepeopleandthethingsthat

weremembered.疑代：先行词本身是who,which等疑问代词时（为避免重复）。Whothat

hasseenthefilmwillforgetit?（看过这部电影的谁）all：先行词被all,every,no,any,theonly,thevery等修饰时。Thisis

theonly

gift

that

Ireceived.（唯一的礼物）2.当关系代词在定语从句中作介词的宾语，且介词被提到关系词前时，只能用

which（指物）或

whom（指人），绝对不能用that或who。Thisisthehouse

inwhich

Ilivedfor10years.Thisisthehouse

which/that

Ilivedinfor10years.3.【关系词在从句中作主语时，主谓一致问题】

当关系代词（who,that,which）在定语从句中作主语时，从句的谓语动词必须和先行词的人称和数保持一致。I,who

am

yourfriend,willhelpyou.（先行词I是单数第一人称，所以从句谓语用am）Heisoneofthestudentswho

are

fromChina.（先行词是students，复数，所以用are）Heistheonlyoneofthestudentswho

is

fromChina.（先行词是theonlyone，单数，所以用is）解题技巧【关系词选择混乱】不会区分who/whom/which/that解题两步法：先找先行词，确定指人还是指物。再分析从句，看关系词在从句中充当什么成分（主/宾/定）。例题：Themuseum______wevisitedyesterdayisfantastic.步骤1：先行词是Themuseum（物）。步骤2：从句是wevisitedyesterday，主谓宾齐全，visited后缺宾语（我们参观了什么？博物馆）。结论：指物+作宾语→可用which或that，且可以省略。【典例破题】1.Isthisthefactory______yourfatherworkedintenyearsago?

A.where B.which C.that D.theone2.Theboy______wonthefirstprizecomesfromasmallvillage.

A.which B.whom C.who D.whose【巩固提升】1．Anyonewhoisaserveror____hasbeenoneknowsthatcustomersalwayscomefirst.A．whom B．what C．who D．which2．—Class,youshouldbethankfultothosepeople_______helpedandsupportedyou.—Wewill.MissChen.A．which B．whom C．who D．whose3．Shehasateenagergranddaughteraboutmyage________isreallykind.A．who B．which C．where D．/4．—Whatareyoulookingfor?—I'mlookingforthedictionary______youlentmelastweek.A．who B．what C．that D．when5．—WhatdoyouthinkoftheshowReadersonCCTV?—It’sagreatTVshow_______expressesourtruefeelingsbyreadingaloudinpublic.A．whom B．who C．whose D．that6．—Whatkindofteachersdoyoulike,John?—Iliketheteachers_____arefriendlytous.A．which B．whose C．who7．—IntheprogramTheSingerin2018,IlikeHuaChenyumost.—Yes.Heisthesinger_______wonthefirstprizeofHappyBoy’sVoicein2013.A．what B．which C．who8．—OnlyYouisaTVprogram_______ispopularwithmostyoungpeople.—Yes,itisdefinitelytrue.A．that B．whose C．what D．who9．YuanLongpingisaChinesericescientist_______________isleadingaresearchtodevelop"searice".A．Who B．whom C．which D．whose10．Dannymetafamousastronaut________wasthefirstCanadianastronautinspace.A．which B．What C．whose D．who考点三状语从句让步状语从句【知识精讲】定义“让步”就是“退一步说”。从句先承认一个事实（退一步），但主句表示这个事实并不影响另一件事情的发生。核心逻辑：“虽然……但是……”（注意：英语中“虽然”和“但是”不能同时出现！）例句：Althoughitwasraining,weplayedfootball.（虽然下雨了，但是我们踢了足球。）→下雨没有影响我们踢球。Hepassedtheexam,thoughhedidn’tstudyhard.（他考试及格了，尽管他没努力学习。）→没努力学习没有影响他及格。引导词1.Although：最常用，较正式。通常位于句首。Althoughheisyoung,heisverywise.2.Though：与although同义，更口语化。位置灵活（句首、句中、句末）。Heisyoung.Heiswise,though.

（放句末时，前面常有逗号）3.Eventhough：语气最强，表示“即使”，强调对比更强烈。EventhoughIwastired,Icouldn’tsleep.

（即使很累，也睡不着。）易错点拨1.【绝对禁忌】Although/Though绝对不能与but连用。中文习惯说“虽然……但是……”，但英语中两者选一。Althoughheisrich,heisnothappy.Heisrich,butheisnothappy.2.Eventhough≠EvenifEventhough：引导让步状语从句，承认的是事实。（“即使，虽然”）Eventhoughheknowsthedanger,hestilltries.（他知道危险，这是事实。）Evenif：引导条件状语从句，假设的是可能的情况。（“即使，就算”）Evenifheknowsthedanger,hewillstilltry.（他可能知道，也可能不知道。）【典例破题】1.______thetaskwasdifficult,theymanagedtofinishitontime.A.But B.Although C.Because D.So2.Hedecidedtowalktowork,______hiscarwasparkedoutside.A.although B.but C.because D.so【巩固提升】1.______thetaskwasdifficult,theymanagedtofinishitontime.A.But  B.Although  C.Because  D.So2.______hewasverytired,hekeptworking.A.Although  B.Because  C.So  D.But3.______itwasrainingheavily,theywentoutforawalk.A.Though  B.If  C.Since  D.Unless4.Shedidn'tgiveup______shefacedmanydifficulties.A.eventhough  B.because  C.sothat  D.aslongas5.______heisyoung,heknowsalotabouthistory.A.As  B.While  C.Because  D.For6.Theyfinishedtheworkontime______itwasatoughchallenge.A.although  B.but  C.so  D.or7.______shehadnomoney,sheboughtagiftforhermother.A.Eventhough  B.Because  C.If  D.Unless8.Hedecidedtogototheparty______hedidn'tfeelverywell.A.though  B.because  C.so  D.for9.______thesunwasshining,theairwasstillcold.A.Although  B.Because  C.So  D.And10.______heisover70,hestillexerciseseveryday.A.While  B.Because  C.Since  D.For结果状语从句【知识精讲】结果状语从句的定义结果状语从句表示主句动作或状态所导致的结果，回答“结果怎么样？”的问题。核心是“如此……以至于……”，强调因果关系。核心逻辑：A（主句）导致B（从句结果）例句：HeransofastthatIcouldn'tcatchup.（他跑得如此快，以至于我追不上。）→“跑得快”导致“我追不上”。Itwassuchaheavyboxthatnobodycouldliftit.（这是一个如此重的箱子，以至于没人能搬动。）→“箱子重”导致“搬不动”。核心结构So...thatvs.Such...that结构公式例句so...thatso+形容词/副词+(a/an)+(名词)+that+从句Themusicwas

sobeautifulthat

everyonestoppedtalking.such...thatsuch+(a/an)+(形容词)+名词+that+从句Itwas

suchafunnystorythat

wealllaughed.易错点拨1.【So和Such的混淆】核心判断方法：看紧跟在后面的词是什么词性。如果是形容词或副词，一定用

so。Heis

socareful

that...（careful是形容词）Heworks

socarefully

that...（carefully是副词）如果是名词，一定用

such。Heis

suchacarefulstudent

that...（student是名词）Theyare

suchcarefulstudents

that...（students是名词）2.【Such后的冠词陷阱】

当名词是单数可数名词时，必须加上

a/an，且放在such和形容词之后。正确：Itwas

suchaninterestingbook

thathelikesreadingitverymuch.3.【与Too...to...结构的混淆】

两者都表示程度，但结构和意义不同：so...that...：如此……以至于……（+完整从句，可以是肯定或否定）Heis

soyoungthathecan'tgo

toschoolalone.（否定结果）Hewas

soexcitedthathejumpedup.（肯定结果）too...to...：太……而不能……（+动词原形，只表否定）Heis

tooyoungtogo

toschoolalone.（不能去）4.【与Enoughto...结构的辨析与转换】so...that...：如此……以至于……（强调程度与结果）...enoughto...：足够……可以……（强调能力）not...enoughto...：不够……以至于不能……转换关系：Heis

sooldthathecango

toschool.=Heis

oldenoughtogo

toschool.Heis

soyoungthathecan'tgo

toschool.=Heis

notoldenoughtogo

toschool.【典例破题】一、单项选择1.Theproblemwas______difficult______noneofuscouldsolveit.

A.so;that B.such;that C.so;as D.such;as2.Itwas______lovelyday______wedecidedtogoforapicnic.

A.sucha;that B.soa;that C.such;that D.so;that【巩固提升】1．（25-26九年级上·上海浦东新·期末）Hehas_______muchworktodothathecan’tgooutwithus.A．so B．such C．too D．very2．（25-26九年级上·福建莆田·月考）Heshared________clearadvice________welearnedalotfromhisspeech.A．sucha;that

B．so;that

C．such;that3．（25-26九年级上·江苏宿迁·期末）—WhatdoyouthinkofthefilmZootopia2?—Ithinkitis________anexcellentfilm________somanyyoungpeoplelikeit.A．such;that B．too;to C．so;that D．enough;to4.Thestoryis______interesting______allthestudentswanttoreaditagain.A.so;that B.such;that C.too;to D.enough;to5Itwas______wonderfulmusic______everyonelostthemselvesinit.A.so;that B.such;that C.sucha;that D.soa;that6.Hehas______littletime______hecan’tfinishhishomeworkontime.A.so;that B.such;that C.too;to D.very;that7.Itis______usefulbook______Idecidetokeepitforever.A.so;that B.sucha;that C.such;that D.soa;that8.Theteacherspoke______fast______noneofuscouldfollowhim.A.such;that B.so;that C.too;to D.enough;to9.Theyare______cleverchildren______theycanworkoutthedifficultproblemeasily.A.so;that B.such;that C.too;to D.enough;that10.Thereis______muchrainthissummer______manyfieldsareflooded.A.so;that B.such;that C.quite;that D.very;that时间状语从句【知识精讲】连词（短语）含义及用法例句when“当……时”；引导的从句可以用延续性动词，也可以用短暂性动词Hewasreadinginthelibrarywhentherainstormcame.while“正当……时；正在……时”；引导的从句中，谓语动词必须是延续性动词，且常用进行时WhileLindawassleeping,JennywashelpingMarywithherhomework.as“当……时”；表示一件事情正在发生，另一件事情也在进行中JustasIwasleavingthehouse,thephonerang.after“在……之后”；表示主句的动作发生在从句的动作之后Peoplewillgettoknowtheadvantagesofyourproductaftertheyuseit.before“在……之前”；表示主句的动作发生在从句的动作之前Turnoffthelightsbeforeyouleavetheroom.until/till“直到……为止”；常用在“not…until…”结构中，表示“直到……才……”Theboydidn'tstoprunninguntilhereachedthefinishingline.since“自……以来”；主句用现在完成时，从句用一般过去时Wehavebeengoodfriendssinceweenteredthesamehighschool.assoonas“一……就……”；引导的从句常用一般现在时，主句用一般将来时IwillgiveyouacallassoonasIarrivehome.whenever“在任何……时候；无论何时”；引导的从句常用一般现在时，主句用一般将来时Wheneverwe'reintrouble，they'llhelpus.易错提醒时间状语从句的时态搭配规则一：主将从现：当主句是将来时，时间状语从句用一般现在时表示将来：IwillcallyouwhenIarrive.（我到达时会给你打电话。）Hewillhelpyouifhehastime.（如果有时间他会帮你。）例外：when引导名词性从句时可用将来时Idon'tknowwhenhewillcome.（我不知道他什么时候会来。→宾语从句）规则二：主过从过：当主句是过去时，时间状语从句通常也用过去时：HewasreadingwhenIentered.（我进来时他正在读书。）Whenhewasyoung,helivedinBeijing.（他年轻时住在北京。）规则三：since从句的时态：since从句用一般过去时，主句用现在完成时Ihaveknownhimsincewewerechildren.（我们从小时候就认识了。）技巧点拨一、核心原则：抓引导词，辨逻辑，对时态时间状语从句的解题核心是通过引导词判断逻辑关系，结合“主将从现”等时态规则匹配选项，排除语法错误和逻辑矛盾项。二、解题步骤（三步走）1.辨引导词，定逻辑关系先看题干和选项中的引导词，明确从句类型，常见逻辑及对应词：时间先后：when（当……时）、while（当……时，接延续性动作）、as（当……时，一边……一边……）先后顺序：before（在……之前）、after（在……之后）、since（自从）、until（直到）同时发生：assoonas（一……就……）、themoment（一……就……）伴随/时段：during（在……期间）、whenever（无论何时）2.用“主将从现”，定时态规则这是解题关键，结合主句时态判断从句时态：主句为一般将来时：从句用一般现在时（表时间/条件）主句为一般过去时：从句用过去相关时态（一般过去时/过去进行时/过去完成时）客观真理/事实：无论主句时态，从句用一般现在时3.排干扰项，避易错点排除引导词误用：如while后接延续性动词，when可接短暂/延续性动词排除语序错误：从句用陈述语序，勿用疑问语序排除时态矛盾：如主句过去时，从句勿用一般现在时（客观真理除外）三、速记口诀时间状语看引导，逻辑关系先辨清；主将从现是准则，时态一致莫忘记；while接延续动作，引导词错不选；陈述语序记心间，干扰选项快速排。【典例破题】1．（2025·福建厦门·模拟预测）XiaoWeididn’tgotobed________hefinishedhishomework.A．if B．until C．since2．（2025·甘肃武威·一模）It’sabouttenyearssincehe________aYoungPioneer.A．becomes B．hasbecome C．became D．becoming【巩固提升】1．（2025・广东广州・模拟预测）Iwillcallyou________Iarriveatthetrainstation.A．assoonasB．whileC．though2．（2025・山东临沂・一模）________youleavetheclassroom,pleaseturnoffthelights.A．AfterB．BeforeC．Until3．（2025・湖南长沙・模拟预测）Hewasreadingnewspapers________hiswifewascookingdinner.A．whenB．whileC．if4．（2025・四川成都・二模）Wehaveknowneachother________wewerechildren.A．sinceB．whenC．until5．（2025・河南洛阳・模拟预测）Thestudentsstoppedtalking________theteachercameintotheclassroom.A．untilB．whenC．before6．（2025・河北保定・一模）Ididn’tstopworking________itwasmidnight.A．unlessB．untilC．since7．（2025・浙江温州・模拟预测）________therainstops,wewillgooutforawalk.A．AssoonasB．WhileC．Because8．（2025・陕西西安・二模）Ithasbeenfiveyears________Imovedtothiscity.A．whenB．sinceC．after9．（2025・江苏南通・模拟预测）Pleasestayhere________yourparentscomeback.A．untilB．thoughC．if10．（2025・湖北武汉・一模）Imetanoldfriend________Iwaswalkingalongthestreetyesterday.A．whileB．sinceC．until条件状语从句【知识精讲】连词（短语）含义及用法例句if“如果”；从句用一般现在时，主句通常用一般将来时Ifitrainstomorrow,Iwillstayathome.unless“如果不;除非”；unless可以转化为if…not…结构。主从句时态与if用法一致Unlessyougetenoughsleepeverynight,youwillnotrememberthingswell.aslongas“只要”；主从句时态与if用法一致Aslongasyoutellmethetruth,I'lltrytohelpyou.条件状语从句的时态规则（1）主将从现：主句将来时，从句一般现在时Ifhecomes,Iwilltellhim.（如果他来，我会告诉他。）（2）主情从现：主句情态动词，从句一般现在时Ifyouworkhard,youcansucceed.（如果你努力工作，你能成功。）（3）主祈从现：主句祈使句，从句一般现在时Ifyouseehim,tellhimtocallme.（如果你见到他，告诉他给我打电话。）易错提醒条件状语从句可以简化为：Withoutair,wecouldnotlive.（如果没有空气，我们不能生存。）=Iftherewerenoair,wecouldnotlive.技巧点拨一、核心逻辑：判从句，辨逻辑，定时态解题关键是先判断从句为条件关系，再结合引导词和时态规则匹配选项，排除语法、逻辑错误项。二、解题步骤（三步走）1.识引导词，定条件逻辑题干/选项中出现表条件的引导词，即为条件状语从句，常见词及逻辑：if（如果）、unless（除非=ifnot）、aslongas（只要）：表条件假设；incase（万一）：表预防条件。2.守时态规则，匹配时态核心遵循主将从现，结合主句时态判断从句时态：主句为一般将来时/含情态动词（can/may/will）：从句用一般现在时；主句为一般过去时：从句用过去相关时态（一般过去时/过去完成时）；客观真理/事实：从句用一般现在时。3.排干扰项，避易错点排除引导词误用：unless表否定条件，勿与if混淆；排除语序错误：从句用陈述语序，勿用疑问语序；排除时态矛盾：主句过去时，从句勿用一般将来时。三、速记口诀条件从句看引导，unless替换ifnot记牢；主将从现是准则，时态一致不混淆；陈述语序记心间，干扰选项快速排。【典例破题】1．（2026·福建福州·一模）Youcancompletethetasksuccessfully________youfollowthesteps.A．asmuchas B．aswellas C．aslongas2．（2026·上海闵行·一模）Mumwon’tusethatsmartkitchen________itcanbecontrolledbyhervoiceeasily.A．unless B．sothat C．because D．when【巩固提升】1．（2025・江西南昌・模拟预测）Hedidn’tgotoschoolyesterday________hewasill.A．becauseB．soC．but2．（2025・云南昆明・一模）Youwillmissthebus________youhurryup.A．ifB．unlessC．though3．（2025・山东青岛・模拟预测）________everyoneishere,let’sstartourmeeting.A．SinceB．UntilC．If4．（2025・广西南宁・二模）Iwillhelpyou________Ihavefreetime.A．whileB．ifC．though5．（2025・辽宁沈阳・模拟预测）Shecried________shefeltverysad.A．whenB．becauseC．if6．（2025・海南海口・一模）Youcan’tpasstheexam________youworkhard.A．unlessB．becauseC．since7．（2025・安徽合肥・模拟预测）Westayedathome________itrainedheavilyoutside.A．thoughB．becauseC．before8．（2025・山西太原・二模）________itiscoldoutside,putonyourcoat.A．IfB．SinceC．Until9．（2025・吉林长春・模拟预测）Iwon’tgototheparty________mymotherallowsme.A．ifB．unlessC．when10．（2025・贵州贵阳・一模）Helikesreading________therearemanyinterestingbooks.A．becauseB．soC．and原因状语从句【知识精讲】连词含义及用法例句because“因为”；常用来回答由why引导的一般疑问句；不能与so连用I'dliketojointheMusicClubbecauseIcanplaythepiano.since“因为;既然”；语气比because弱Sincewehavealreadygrownup,wecannotactlikelittlebabies.as“因为;由于”；语气比since弱Asyouwereout,Ileftamessage.技巧点拨一、核心逻辑：找标志，辨逻辑，选连词解题关键是通过句意判断因果关系，匹配对应的原因引导词，排除逻辑矛盾和用法错误的选项。二、解题步骤（三步走）1.识引导词，定因果逻辑题干出现表“因为、由于、既然”等含义的引导词，即为原因状语从句，常见词及用法：because（因为）：语气最强，直接回答why提问，可用于强调句；since（既然）：双方已知的原因，语气较弱；as（由于）：显而易见的原因，语气最弱；nowthat（既然）：强调现在的已知原因。2.看语境，选正确引导词问“为什么”并直接解释原因：优先选because；双方都知道的原因：选since；显而易见的原因：选as；强调现在的新原因：选nowthat。3.排干扰项，避易错点排除because与so连用：because表原因，so表结果，二者不可同用；排除引导词混淆：since还可表时间，需结合语境区分；排除语序错误：从句用陈述语序，勿用疑问语序。三、速记口诀原因从句看引导，because答why最分明；since表已知，as表显然；becauseso不碰头，陈述语序记心间。【典例破题】1．（25-26九年级上·江苏无锡·期末）________ourtopicisaboutprotectingtheocean,IplantostartourreportwithBluePlanet.A．Since B．Although C．While D．Unless2．（25-26九年级上·安徽合肥·期中）Museumsarebecomingmorepopular______peoplewanttolearnmoreaboutcultureandhistory.A．until B．unless C．as D．although【巩固提升】1．（2025・江苏苏州・模拟预测）Ididn’tgorunningthismorning________thewindwastoostrong.A．becauseB．thoughC．if2．（2025・浙江嘉兴・一模）________youknowthetruth,Iwon’thideanythingfromyou.A．SinceB．UntilC．While3．（2025・广东佛山・模拟预测）Hefailedtheexam________hedidn’tstudyhard.A．soB．becauseC．but4．（2025・山东潍坊・二模）Wedecidedtowalkhome________therewasnobusleft.A．asB．whenC．unless5．（2025・湖北宜昌・模拟预测）ShespeaksEnglishverywell________shepracticeseveryday.A．ifB．becauseC．though6．（2025・四川绵阳・一模）________everyoneisready,let’sstartthegamenow.A．BecauseB．SinceC．Before7．（2025・湖南株洲・模拟预测）Tomstayedinbedallday________hehadabadcold.A．untilB．becauseC．after8．（2025・河南安阳・二模）________itisrainingoutside,wehavetostayindoors.A．AsB．IfC．Though9．（2025・河北唐山・模拟预测）Ilikethisstory________itisverymoving.A．becauseB．soC．or10．（2025・陕西宝鸡・一模）Hemus