2026年八年级英语下册第5单元语法填空题库

2026年八年级英语下册第5单元语法填空题库一、单项选择题（总共10题，每题2分，共20分）1.Mr.Smithisinterestedincollectingstamps,______hespendsmostofhisfreetime.A.becauseB.soC.butD.although解析：本题考查连词辨析。句意为“史密斯先生对收集邮票很感兴趣，______他大部分空闲时间都花在这上面。”空格前后为转折关系，故选C。A表示原因，B表示结果，D表示让步，均不符合语境。2.Theteacheraskedthestudents______theyhadfinishedtheirhomeworkbeforetheclassstarted.A.ifB.whetherC.thatD.what解析：本题考查宾语从句。句意为“老师问学生们上课前是否完成了作业。”ask后需跟宾语从句，且从句中不缺成分，故用whether或if引导。C和D不符合语法结构，故选A或B。3.______sheisyoung,sheworksmuchharderthanmanyadults.A.BecauseB.ThoughC.AsD.So解析：本题考查让步状语从句。句意为“______她很年轻，但她的工作努力程度比许多成年人还高。”空格后为形容词，需用though或while引导，故选B。4.Ifit______tomorrow,wewillgotothezoo.A.won’trainB.doesn’trainC.won’tberainingD.isn’training解析：本题考查一般现在时虚拟语气。句意为“如果明天不下雨，我们就去动物园。”if引导的条件状语从句用一般现在时表将来，主句用一般将来时，故选B。5.Theboy______livesnextdoorisagoodfriendofmine.A.whoB.whomC.whoseD.that解析：本题考查定语从句。句意为“住在隔壁的那个男孩是我的好朋友。”先行词指人，且在从句中作主语，需用who或that，whom作宾语，whose作定语，故选A。6.Mysisterisgoodatplayingthepiano,______mybrotherisgoodatswimming.A.andB.butC.orD.so解析：本题考查并列连词。句意为“我姐姐擅长弹钢琴，______我弟弟擅长游泳。”空格前后为转折关系，故选B。7.Itisimportantforstudents______theyshouldstudyhardeveryday.A.thatB.whatC.howD.when解析：本题考查主语从句。句意为“学生每天努力学习是很重要的。”It作形式主语，空格处需填that引导的主语从句，故选A。8.Thebook______Iborrowedfromthelibraryisveryinteresting.A.whichB.thatC.whoseD.whom解析：本题考查定语从句。句意为“我从图书馆借的那本书很有趣。”先行词指物，且在从句中作主语，需用which或that，whose作定语，whom指人，故选A。9.Ifyou______morecarefully,youwouldn’thavemadesuchamistake.A.hadworkedB.workedC.hadbeenworkingD.wereworking解析：本题考查虚拟语气。句意为“如果你更仔细一点，就不会犯这样的错误了。”if条件句省略if，主句用过去完成时表与过去事实相反，故选A。10.Thestudentsarebusy______forthefinalexam.A.toprepareB.prepareC.preparingD.prepared解析：本题考查非谓语动词。句意为“学生们正忙着为期末考试做准备。”bebusydoingsth.为固定结构，故选C。二、填空题（总共10题，每题2分，共20分）1.Sheisinterested______collectingstampsandcoins.2.Althoughthetaskisdifficult,heisdetermined______it.3.Ifit______tomorrow,wewillhaveapicnic.4.Thegirl______issittingonthebenchismysister.5.Myfatherisateacher,______mymotherisadoctor.6.Itisimportant______youshouldfinishyourhomeworkontime.7.Theman______Ispoketolastnightisafamouswriter.8.IfI______you,Iwouldstudyharder.9.Thestudentsarebusy______forthecomingcompetition.10.Sheisgoodatsinging,______sheisnotgoodatdancing.三、判断题（总共10题，每题2分，共20分）1.Theteacheraskedthestudentsiftheyhadfinishedtheirhomeworkbeforetheclassstarted.(×)解析：if引导宾语从句时，若主句主语为I/you，可用if；若主句主语为he/she/it，需用whether，故错误。2.Thoughheisyoung,heworksmuchharderthanmanyadults.(√)解析：though引导让步状语从句，符合语法规则，正确。3.Ifitrainstomorrow,wewillgotothezoo.(√)解析：if引导条件状语从句，用一般现在时表将来，正确。4.Theboywholivesnextdoorisagoodfriendofmine.(√)解析：who引导定语从句，先行词指人且作主语，正确。5.Mysisterisgoodatplayingthepiano,andmybrotherisgoodatswimming.(√)解析：and连接并列句，符合语法规则，正确。6.Itisimportantthatstudentsshouldstudyhardeveryday.(×)解析：that引导主语从句时，从句用陈述句语序，去掉should，故错误。7.ThebookthatIborrowedfromthelibraryisveryinteresting.(√)解析：that引导定语从句，先行词指物且作主语，正确。8.Ifyouworkmorecarefully,youwouldn’thavemadesuchamistake.(×)解析：if条件句省略if，主句用一般现在时表与现在事实相反，故错误。9.Thestudentsarebusypreparingforthefinalexam.(√)解析：bebusydoingsth.为固定结构，正确。10.Sheisgoodatsinging,butsheisnotgoodatdancing.(√)解析：but连接并列句，符合语法规则，正确。四、简答题（总共8题，每题2分，共16分）1.Explaintheuseof"because"insentences.参考答案：because用于引导原因状语从句，表示直接原因，常放在主句后。例如：Sheishappybecauseshepassedtheexam.2.Whatisthedifferencebetween"if"and"whether"?参考答案：if和whether都可引导宾语从句，但if不可用于介词后或名词后；whether可连接并列句，if不可。例如：Idon’tknowif/whetherhewillcome.3.Howdoyouuse"though"inasentence?参考答案：though引导让步状语从句，可倒装（把表语或状语提前）。例如：Thoughheisrich,heisnothappy.4.Whenshouldweuse"that"inasentence?参考答案：that引导名词性从句（主语、宾语、表语从句）时，从句不缺成分且用陈述句语序。例如：Itisafactthatheisright.5.Explaintheuseof"which"insentences.参考答案：which引导定语从句，先行词指物且在从句中作主语或宾语；也可引导名词性从句。例如：ThebookwhichIborrowedisinteresting.6.Howdoyouuse"and"insentences?参考答案：and连接并列主语、谓语、宾语等。例如：Sheissmartandhardworking.7.Whatisthestructureof"bebusydoingsth."?参考答案：bebusydoingsth.意为“忙于做某事”，be为系动词，busy为形容词，doingsth.为动名词短语。例如：Heisbusypreparingfortheexam.8.Howdoyouuse"if"inasentence?参考答案：if引导条件状语从句，用一般现在时表将来，一般将来时表主句。例如：Ifitrainstomorrow,wewillstayathome.五、应用题（总共8题，每题4分，共24分）1.Completethefollowingsentence:"Although______,henevergivesup."参考答案：heistired解析：though引导让步状语从句，空格处需填主语，故填heistired。2.Completethefollowingsentence:"Ifyou______morecarefully,youwon’tmakemistakes."参考答案：readtheinstructions解析：if条件句用一般现在时表将来，空格处需填动词原形，故填readtheinstructions。3.Completethefollowingsentence:"Thegirl______issittingonthebenchismysister."参考答案：who解析：who引导定语从句，先行词指人且作主语，故填who。4.Completethefollowingsentence:"Myfatherisateacher,______mymotherisadoctor."参考答案：and解析：and连接并列句，符合语法规则，故填and。5.Completethefollowingsentence:"Itisimportant______youshouldfinishyourhomeworkontime."参考答案：that解析：that引导主语从句，从句用陈述句语序，故填that。6.Completethefollowingsentence:"Theman______Ispoketolastnightisafamouswriter."参考答案：whom解析：whom引导定语从句，先行词指人且作宾语，故填whom。7.Completethefollowingsentence:"IfI______you,Iwouldstudyharder."参考答案：were解析：虚拟语气中，if条件句省略if，主句用过去式表与现在事实相反，故填were。8.Completethefollowingsentence:"Thestudentsarebusy______forthecomingcompetition."参考答案：preparing解析：bebusydoingsth.为固定结构，故填preparing。标准答案及解析一、单项选择题1.C2.A/B3.B4.B5.A6.B7.A8.A9.A10.C二、填空题1.in2.tofinish3.rains4.who5.and6.that7.who8.were9.preparing10.but三、判断题1.×2.√3.√4.√5.√6.×7.×8.√9.√10.√四、简答题1.参考答案：because用于引导原因状语从句，表示直接原因，常放在主句后。例如：Sheishappybecauseshepassedtheexam.解析：because引导原因状语从句，从句用陈述句语序，主句用一般现在时或一般过去时。2.参考答案：if和whether都可引导宾语从句，但if不可用于介词后或名词后；whether可连接并列句，if不可。例如：Idon’tknowif/whetherhewillcome.解析：if和whether在引导宾语从句时基本可互换，但whether更灵活，可连接并列句。3.参考答案：though引导让步状语从句，可倒装（把表语或状语提前）。例如：Thoughheisrich,heisnothappy.解析：though引导让步状语从句时，可倒装，如Thoughrich,heisnothappy.4.参考答案：that引导名词性从句（主语、宾语、表语从句）时，从句不缺成分且用陈述句语序。例如：Itisafactthatheisright.解析：that引导名词性从句时，从句不缺成分，若缺成分需用what/which/who等。5.参考答案：which引导定语从句，先行词指物且在从句中作主语或宾语；也可引导名词性从句。例如：ThebookwhichIborrowedisinteresting.解析：which引导定语从句时，先行词指物且在从句中作主语或宾语；也可引导宾语从句。6.参考答案：and连接并列主语、谓语、宾语等。例如：Sheissmartandhardworking.