初中英语语法综合练习题（有答案）

初中英语语法综合练习题（有答案）初中英语语法综合练习题（有答案）、单项选择1、Theboylikesquestions.A．askB．answerC．toask2、We'lltrythereontime.A．togetB．gettingC．got3、Theyhopedtheirmothersoon.A．toseeB．sawC．seeing4、I'mgladyouagain.A．meetB．metC．tomeet5、Heoftenhelpsmemybike.A．mendingB．tomendC．tomended6、IheardAliceinthenextdoor.A．singsB．sangC．sing7、Theworkiseasy.Lethimitbyhimself.A．doB．todoC．doing8、HesawDickinandtakeabookaway.A．cameB．comingC．come9、DoesJackwantawriter?A．beB．isC．tobe10、Thebosshadthemfrommorningtonight.A．workedB．workingC．work11、It'stimehome.A．togoB．wentC．going12、Tomiskind.Hewouldlikeyou.A．tohelpB．helpC．helped13、Don'tforgetyourbookstoschool.A．bringB．tobringC．brought14、Idon'tknow.A．wheredoesheliveB．whatishedoingC．wherehelivesD．whatheisdringit15、Askhimhowmuch.A．diditcostB．costitC．itcostedD．itcosts16、Iwonderusedfor.A．whatwasthisroomB．whichwasthisroomC．whatthisroomwasD．thatthisroomwas17、Ireallydon'tknow.A．wherehewasbornB．whereheisbornC．wherewashebornD．whereisheborn18、Wehavenoiden.A．howworriedwasheB．howworriedhewasC．thatwasheworriedD．whatwasheworried19、Hewantedtoknowthere.A．howlongtimeIhadbeenB．howlonghadIbeenC．howlongIhadbeenD．howlongIwas20、Mymotherwantstoknow.A．howisTomgettingalongB．howheisgettingalongC．whatishegettingalongD．whatheisgettingalong21、Whatshallwedoitrainstomorrow?A．ifB．whenC．since22、Thedoctordidn'thavearesttheoperationwasover.A．beforeB．afterC．until23、Shedidn'tgotothecinemashewasverybusy.A．whenB．untilC．because24、Hisparentsdidn'tsendtheirchildrentoschoollifewashard.A．ifB．whileC．because25、Finishdoingyourhomeworkyougotobed.A．beforeB．untilC．after26、Thefilmwasinterestingallofuswantedtoseeitagain.A．as,asB．so,thatC．such,that27、heheardagirlcryingforhelpoutside,herushedoutoftheroom.A．BeforeB．AssoonasC．after28、TherearestudentsinClassOneinClassTwo.A．asmany,thanB．asmuch,asC．more,thanD．somany,as29、IwaswatchingTV,mysisterwasliteningtotheradioprogramme.A．AfterB．WhileC．Before30、Let'swaitforhimheback.A．until,willcomeB．until,cameC．if,willcomeD．until,comes31、I'llrememberhertheletter.A．giveB．gaveC．togive32、Heturnedontheradioandstoppedtotheradio.A．listenedB．tolistenC．listening33、Hehaddecideditagain.A．writtenB．writingC．towrite34、It'scold.Youneedwarmclothes.A．towearB．wearingC．wore35、MrBlackmillagreetherewithyou.A．togoB．wentC．willgo36、Theywereabletolastyear.A．swamB．swimC．swimming37、Sheispleasedherfriend.A．tomeetB．metC．meeting38、Theyweresorrythat.A．tohearB．heardC．hearing39、Heissuretomorrow.A．tocomeB．willcomeC．coming40、Teachertoldusquiet.A．isB．areC．tobe41、Hewillteachmethisyear.A．toskateB．skatingC．skated42、Theyaskedhimanynoise.A．notmakingB．nomakeC．nottomake43、DidyouhearherthesonginEnglishlastnight?A．singB．sangC．tosingD．sings44、Thestudentsdon'tknownext.A．todowhatB．whattodoC．whatdoD．dowhat45、Thebossmadethemtenhoursaday.A．workedB．workingC．workD．towork46、I'dlikemygoodfriendtomyhome.A．comeB．willcomeC．comingD．tocome47、Willyouhelpmethismorning?A．dothewashB．todothewashC．dothewashingD．doingthewashing48、I'dlovethatfilm,willitbeontomorrow?A．seeB．toseeC．seeingD．seen49、Hetoldthemonwiththework.A．togoB．goingC．goD．went50、We'lltrytheworkbeforeseveno'clock.A．finishedB．finishC．tofinishD．finishing51、It'sraininghard.You'dbetter.A．gooutB．notgooutC．notogooutD．tonotgoout52、Thismathsproblemisdifficult.Letmeitover.A．tothinkB．thinkingC．thinkD．thought53、SorryI'vekeptyouforalongtime.A．waitB．towaitC．waitingD．waited54、It'snoteasyaforeignlanguage.A．learnsB．learnC．tolearnD．learning55、Thedoctorwasbusyonthewomanatthattime.A．operateB．operatingC．tooperateD．operated56、I'mhungry.Pleasegivemesomething.A．eatB．eatingC．toeatD．eaten57、MrSmithenjoystolightmusic.A．listensB．tolistenC．listeningD．listen58、Itwasverylateatnighthestillwenton.A．worksB．workedC．workingD．work59、Whentheywalkedalongtheriver,theysuddenlyheardsomebodyforhelp.A．callB．callingC．calledD．tocall60、Stopandlistentomecarefullysaidtheteacher.A．totalkB．talkingC．talkD．talks61、TheteacheraskedmethequestioninEnglish.A．answerB．toanswerC．answeredD．answering62、Itwaseleveno'clock,shestoppedthechildfromTV.A．watchB．watchingC．towatchD．watched63、Heisstrongenougnthebox.A．carryB．tocarryC．carryingD．carries64、Pleasebequiet.Youtalkloudlyinthelibrary.A．needn'tB．mustn'tC．needD．must65、Don'tbelate.Youbethereontime.A．mustB．canC．mayD．needn't66、"IspeaktoAnn?""Speaking."A．MustB．MayC．NeedD．Shall67、I'velookedformypeneverywhere,butIfindit.A．couldn'tB．can'tC．mustn'tD．didn't68、ExcusemeIaskyouaquestion?A．willB．doC．mayD．would69、Thissciencebookgoodcareof.A．mustbetakeB．musttakeC．mustbetakenD．musttobetaken70、"MustIfinishmyhomeworknow?""No,you."A．mustn'tB．can'tC．needn'tD．maynot71、"Youmustbehereatsixtomorrowmorning.""SorryIbeheresoearly."A．needB．mustC．mayD．can't72、youanswerthetelephone,please?A．MustB．MayC．NeedD．Could73、Don'tbelate.Youbethereontime.A．mustB．canC．mayD．needn't74、Wecatchupwithyou.Pleasespeakalittlemoreslowly.A．canB．can'tC．maynotD．must75、ThiswatchnextMonday.A．canmendedB．canbemendedC．canbemendD．canbemending76、Thestarsinthedaytime.A．can'tbeseeB．can'tseeC．can'tbesawD．can'tbeseen77、Tomwasveryhungryheateallthecakes.A．andB．butC．soD．or78、Theteacherisverytiredsheisstillworkingveryhard.A．butB．soC．andD．or79、MrWanghasworkedthereitopened.A．becauseB．sinceC．forD．so80、We'llgotovisittheGreatWallitdoesn'traintomorrow.A．sinceB．beforeC．whenD．if81、Icameintotheoffice,theteacherswerehavingameeting.A．WhenB．WhileC．WhichD．Since82、It'salongtimewemetlast.A．beforeB．afterC．sinceD．so83、Ididn'twatchTVIfinishedmywork.A．afterB．whenC．whileD．until84、Iheareasy.A．thatphysicsisn'tB．ifphysicsisn'tC．whatphysicsisD．thatphysics85、Shetolemeherteacher.A．MrGreenisB．thatMrGreenisC．ifMrGreenwasD．MrGreenwas86、Doyouknowtothatpostoffece?A．HowmuchisitB．howfaritisC．howfarisitD．howlongitis87、DoyourememberhowmanytimestoAmerica?A．haveyoubeenB．hadyoubeenC．didyougoD．youhavebeen88、Ididn'tknowintheclassroom.A．issheB．ifsheisC．ifwassheD．ifshewas89、DoesanybodyknowforXi'antomerrow?A．ifisLicyleavingB．ifLucyleavesC．thatLucyisleavingD．thatLicyleaves90、Doyouknowbacksoon?A．whenshewillcomeB．ifwillshecomeC．ifshewillcomeD．ifshecomes91、Iheardbadlyhurt.A．thathissonisB．ifhissonwasC．thathissonwasD．ifhissonwas92、I'mnotsurethisway.A．thewordcanbeusedB．ifcanthewordbeusedC．ifthewordcanbeusedD．thatthewordcanbeused93、Idon'tknow.A．what'shisnameB．whatnameishisC．whathisnameisD．whatwashisname94、Doyouknowsoworried?A．whyisyourfriendB．whywasyourfriendC．whyyourfriendisD．howisyourfriend95、Doyouknow?A．whoseclildheisB．whosechildisheC．whoseclildheisD．who'schildheis96、Heaskedwhichpicture.A．IsMike'sB．Mike'swasC．wasMike'sD．Mike'sis97、Canyoutellmehowoftentoseehisbrother?A．doeshegoB．hegoesC．hegoD．heis98、Theteacherdidn'ttellmetohaveatestnextweek.A．ifwearegoingB．ifweweregoingC．thatwearegoingD．wearegoing1D5CAACB6?D10CACCC11?D15AABBD16?D20CABCB21?D25ACCDA26?D30BBCBD31?D35CBCAA36?D40BAAAC41?D45ACABC46?D50DCBAC51?D55BCCCB56?D60CCCBB61?D65BBBBA66?D70BBCCC71?D75DDABB76?D80DCABD81?D85ACDAD86?D90BDDCC91?D95CCCCA96?D98CBB定语从句专项练习题及详解50题1.Theplace_______interestedmemostwastheChildren'sPalace（少年宫）.A.WhichB.whereC.whatD.inwhich2.Doyouknowtheman_______?A.whomIspokeB.towhospokeC.IspoketoD.thatIspoke3.Thisisthehotel_______lastmonth.A.whichtheystayedB.atthattheystayedC.wheretheystayedatD.wheretheystayed4.Doyouknowtheyear______theChineseCommunistPartywasfounded?A.whichB.thatC.whenD.onwhich5.Thatistheday______I'llneverforget.A.whichB.onwhichC.inwhichD.when6.Thefactory______we'llvisitnextweekisnotfarfromhere.A.whereB.towhichC.whichD.inwhich7.Greatchangeshavetakenplacesincetheninthefactory_______weareworking.A.whereB.thatC.whichD.there8.Thisisoneofthebestfilms_______.A.thathavebeenshownthisyearB.thathaveshownC.thathasbeenshownthisyearD.thatyoutalked9.Canyoulendmethebook______theotherday?A.aboutwhichyoutalkedB.whichyoutalkedC.aboutthatyoutalkedD.thatyoutalked10.Thepen______heiswritingismine.A.withwhichB.inwhichC.onwhichD.bywhich11.Theyarrivedatafarmhouse,infrontof______satasmallboy.A.whomB.whoC.whichD.that12.Theengineer______myfatherworksisabout50yearsold.A.towhomB.onwhomC.withwhichD.withwhom13.Itthereanyoneinyourclass______familyisinthecountry?A.whoB.who'sC.whichD.whose14.I'minterestedin______youhavesaid.A.allthatB.allwhatC.thatD.which15.Iwanttousethesamedictionary______wasusedyesterday.A.whichB.whoC.whatD.as16.Heisn'tsuchaman______heusedtobe.A.whoB.whomC.thatD.as17.HeisgoodatEnglish,______weallknow.A.thatB.asC.whomD.what18.LiMing,______totheconcertenjoyeditverymuch.A.IwentwithB.withwhomIwentC.withwhoIwentD.Iwentwithhim19.Idon'tlike______asyouread.A.thenovelsB.thesuchnovelsC.suchnovelsD.samenovels20.Hetalkedalotaboutthingsandpersons________theyrememberedintheschool.A.whichB.thatC.whomD.what21.Theletterisfrommysister,______isworkinginBeijing.A.whichB.thatC.whomD.who22.Inourfactorythereare2,000workers,twothirdsof____arewomen.A.themB.whichC.whomD.who23.You'retheonlyperson______I'veevermet______coulddoit.A.who;/B./;whomC.whom;/D./;who24.Ilostabook,______Ican'tremembernow.A.whosetitleB.itstitleC.thetitleofitD.thetitleofthat/doc/bc10597207.html,stsummerwevisitedtheWestLake,______Hangzhouisfamousintheworld.A.forwhichB.forthatC.inwhichD.what26.Ihaveboughtsuchawatch_______wasadvertisedonTV.A.thatB.whichC.asD.it27.Icanneverforgettheday_______weworkedtogetherandtheday______wespenttogether.A.when;whichB.which;whenC.what;thatD.onwhich;when28.Theway______helooksatproblemsiswrong.A.whichB.whoseC.whatD./29.Thisisthereason______hedidn'tcometothemeeting.A.inwhichB.withwhichC.thatD.forwhich30.Thismachine,______formanyyears,isstillworkingperfectly.A.afterwhichIhavelookedB.whichIhavelookedafterC.thatIhavelookedafterD.Ihavelookedafter31.Thereason______hedidn'tcomewas______hewasill.A.why;thatB.that;whyC.forthat;thatD.forwhich;what32.Heisworkinghard,______willmakehimpassthefinalexam.A.thatB.whichC.forwhichD.who33.Thatisnottheway______Idoit.A./B.whichC.forwhichD.withwhich34.Ihavetwogrammars,______areofgreatuse.A.allofwhichB.eitherofwhichC.bothofthatD.bothofwhich35.Iwanttousethesametools_______usedinyourfactoryafewdaysago.A.aswasB.whichwasC.aswereD.which36.Myneighboursusedtogivemeahandintimeoftrouble,_______wasverykindofthem.A.whoB.whichC.thatD.it37.Thisisthemagazine_______Icopiedtheparagraph.A.thatB.whichC.fromthatD.fromwhich38.Heisnotsuchaman_______wouldleavehisworkhalfdone.A.thatB.whichC.whoD.as39.Youcandependonwhateverpromise_______hemakes.A./B.whyC.whenD.whose40.Smoking,_______isabadhabit,is,however,popular.A.thatB.whichC.itD.though41.---Didyouasktheguard_______happened?---Yes,hetoldmeall_______heknew.A.what;thatB.what;whatC.which;whichD.that;that42.Ishallneverforgetthoseyears_______Ilivedonthefarmwiththefarmers,_______hasagreateffectonmylife.A.when;whoB.that;whichC.which;thatD.when;which43.Thenumberofthepeoplewho_______cars_______increasing.A.owns;areB.owns;isC.own;isD.own;are44.Duringthedays________,heworkedasaservantattheBrowns.A.followedB.followingC.tofollowD.thatfollowed45.Isoxygentheonlygas_______helpsfireburn?A.thatB./C.whichD.it46.Thecleverboymadeaholeinthewall,_______hecouldsee_____wasgoingoninsidehouse.A.which;whatB.throughwhich;whatC.throughthat;whatD.what;that47.Is_______someGermanfriendsvisitedlastweek?A.thisschoolB.thistheschoolC.thisschooloneD.thisschoolwhere48.Johngotbeateninthegame,_______hadbeenexpected.A.asB.thatC.whatD.who49.Ihaveboughttwoballpens,_______writeswell.A.noneofthemB.neitherofthemC.neitherofwhichD.noneofwhich50.Allthatcanbeeaten_______eatenup.A.arebeingB.hasbeenC.hadbeenD.havebeen参考答案及解析1.A.which用作关系代词，在定语从句中作主语。2．C."和谁讲话”要说speaktosb.本题全句应为DoyouknowthemanwhomIspoketo.。whom是关系代词，作介词to的宾语，可以省略。3.D.where是关系副词，表示地点，在定语从句中作地点状语。4.C.when是关系副词，表示时间，在定语从句中作时间状语。5．A.which是关系代词，在从句中作forget的宾语。其他几个答案都不能作宾语。6．C.解析同第5题。7.A.解析见第3题。8.A.本句话的先行词应该是films,因此，关系代词that是负数概念，其谓语动词应用复述的被动语态havebeenshown。如果句中的one前面使用了定冠词the，则theone应该视为先行词。9.A.“谈到某事物”应说talkaboutsth.。about是介词，其后要用which作宾语，不能用that。10.A.withwhich是"介词+关系代词"结构,常用来引导定语从句.with有"用"的意思,介词之后只能用which,不能用that.withwhich在定语从句中作状语,即heiswritingwithapen.11.C.infrontofwhich即infrontofafarmhouse.Infrontofwhich在从句中作状语.12.D.withwhom引导定语从句.withwhom放在从句中即为:myfatherworkswiththeengineer.13.D.whose引导定语从句,在从句中作主语family的定语.14.A.that引导定语从句,因为先行词是all,所以只能选用that引导.15.D.thesame……..as是固定用法,as引导定语从句时,可以作主语,宾语或表语.在本句话中,as作从句的主语.16.D.such………as是固定用法,as引导定语从句时,可以作主语,宾语或表语.在本题中,as作表语.17.B.as作关系代词可以单独用来引导非限制性定语从句。这时as所指代的不是主句中某个名词，而往往指代整个主句的含义。as在从句中可以作主语、宾语。从句可放在主句后，也可置于主句前。在本句中,as作宾语.18.B.LiMingenjoyeditverymuch是主句,withwhomIwenttotheconcert是定语从句.withwhom放在从句中为:IwenttotheconcertwithLiMing.19.C.as引导定语从句时通常构成such…as或thesame…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。Such修饰单数名词时,要用sucha……..,本题中suchbooks,such直接修饰复数名词.20.B.things和persons是先行词.当定语从句要修饰的先行词是既表示人,又表示物的名词时,其关系代词要用that.21.D.who引导非限制性定语从句,who作从句的主语.22.C.twothirdsofwhom即:twothirdsofthe2,000workers.23.D.先行词person后有两个定语从句,第一个从句省略了关系代词whom.因为,whom作从句中met的宾语,可以省略.第二个从句whocoulddoit.who在从句中作主语,不可省略.24.A.whosetitle引导非限制性定语从句,whosetitle也可以说成thetitleofwhich25.A.forwhich引导定语从句,使用介词for,是来自于从句中的固定短语befamousfor"以……..而闻名".26.C.当先行词被such修饰时,引导定语从句的关系代词要用as.As在本从句中作主语.27.A.两个先行词theday都是表示时间的名词,但第一个空白处要填的关系词在从句中作状语,因此要用关系副词when.第二个空白处要填的关系词在从句中作动词spent的宾语,因此要用关系代词which或that来引导定语从句.28.D.在way、distance、direction等词后的定语从句中，常用that来代替“in(或其他介词)+which”、when或where，而that常可省略。29.D.forwhich在定语从句中作原因状语,可用why来替代.30.B.whichIhavelookedafter构成一个非限制性定语从句.31.A.Thereasonwhy…wasthat….已成为一种固定句型，这一句中的why和that不能随意换位，也不能将that改成because，尽管that这个词在译文中可能有“因为”的含义。32.B.非限制性定语从句常用which引导,which表示前句话的整个含义.33.A.解释见28题.34.D.主句中的two表明不能选A.从句中的are表明不能选B.bothofwhich用来引导非限制性定语从句.35.C.as引导定语从句时通常构成such…as或thesame…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。本题中as作从句的主语.36.B.非限制性定语从句常用which引导,which表示前句话的整个含义.37.D.38.D.解析见35题.39.A.hemakes是定语从句,从句前省略了关系代词that.40.B.whichisabadhabit非限制性定语从句.41.A.whathappened是宾语从句.all之后thatheknew是定语从句.先行词是all,所以关系代词只能用that.42.D.years是表示时间的名词,用when引导定语从句,是因为when在从句中作时间状语.第二个空选用which,引导一个非限制性定语从句.43.C.本句话的定语从句是whoowncars.其先行词是people,因此,定语从句的谓语动词要用复数的own。本句话主句的主语是Thenumberof指“…..的数目”，是单数概念。因此，主句的谓语动词要用is。44.D.thatfollowed是定语从句，关系代词that在从句中作主语。45.A.先行词gas被only修饰，关系代词要用that，而不用which。46.B.throughwhich引导定语从句，throughwhich即throughthehole,在定语从句中作状语。What引导的是see的宾语从句，并作从句的主语。47.B.为便于理解，改写本句话：ThisistheschoolthatsomeGermanfriendsvisitedlastweek.不难看出，作表语的theschool是先行词。that引导了定语从句，因为that同时又作visited的宾语，所以被省略了。其它选项结构不对。48.A.解释见35题。49.C.因为是twoballpens,并且定语从句的谓语writes是单数概念。因此，C是正确选项。50.B.本句话中，主句的主语是all,为抽象概念。因此，其谓语应用单数的hasbeen。关系代词that引导定语从句，并在从句中作主语。用关系代词填空:1.Theperson_______theytalkedaboutisanexpertongeography.2.Heisakind-heartedman_______iswillingtohelpthoseintrouble.3.Inthehospitalsarethepatients_______thedoctorsandnurseslookaftercarefully.4.Thefilmisaboutaman_______wifeisaspy.5Livinginahouse_______windowsaremadeofpaperwouldbehorrible.6Atthegiftshopheboughtanexpensivepen_______wasmadeinFrance.7Lastmonthwevisitedabigfactory_______producedcarsandbuses.8Idon’tbelieveanything_______hesaid.9Thisisthemostinterestingstory_______he’sheard.10Thefirstthing______wemustdonowistomendtheseshoes.11Thelab______theysetupisequippedwithcomputers.12I’llneverforgetthevillage_______Ivisitedthissummerholiday.13NationalDayistheday_______mostofthepeoplecanremember.14Idon’tbelievethereason______hetoldmeforhisbeinglate.★清华大学★英语系测试：为中小学生英语量身定做.官方网站：/doc/bc10597207.html,/清华大学英语教授50年研究成果现在进行时现在进行时的基本用法1.表示说话时正在进行的动作常和now连用，有时用一个look、listen,来表now这一时间概念。*Look!Atrainiscoming.看，火车来了。*Listen!Heisplayingthepiano.听，他在弹琴。2.表示现阶段正在进行的动作但不一定是说话时正在进行。常和atpresent,thisweek,thesedays…等时间状语连用。*Whatlessonareyoustudyingthisweek?你们本周学哪一课了？（说话时并不在学）3.现在进行时有时可用来表示一个在最近按计划或安排要进行的动作即是说可以用来代替将来时，但此时，一般要与表示将来时的时间状语连用，而且仅限于少量动词。如：go,come,leave,start,arrive,return.sleep*AreyougoingtoTianjintomorrow?你明天去天津吗?*Howmanyofyouarecomingtothepartynextweek?你们有多少人下周要来参加晚会？三、一般将来时█一般将来时1.begoingto+动词原形~对于将要发生的事，或打算、计划、决定要做的事情时，皆以begoingto+动词原形的句型来表示。因此此句型有be动词，所以是否用am,is,are,决定于主语。1.肯定句：主语+be(is,am,are)goingto+动词原形IamgoingtoplayfootballnextSunday.下周日我打算踢足球。

Heisgoingtotravelaroundtheworld.他计划周游世界。

Theyaregoingtomeetoutsidetheschoolgate.他们打算在校门口见面。

Itisgoingtorain.要下雨了。2.否定句：主语+be(am,are,is)notgoingto+动词原形Wearenotgoingtohaveanyclassesnextweek.下周我们不上课。

I’mnotgoingtobeateacher.我不打算当老师。

Heisn’tgoingtoseehisbrothertomorrow.他明天不准备去看他哥哥。3.疑问句：Be(Am,Is,Are)+主语+goingto+动词原形

Areyougoingtobeadoctorwhenyougrowup?你长大了，打算当一名医生吗？Yes,Iam.是的，我打算当。No,I’mnot.不，我不打算当。will同begoingto的用法相同以今天为起点的所有将来时间，如：thisafternoon/thisevening=tonight/tomorrow/tomorrowmorning/afternoon/evening,thedayaftertomorrow/nextweek,nextWednesday/nextmonth,nextSeptember/nextyear.★“begoingto+动词原形”表示计划、打算、将来发生的动作，常和thisafternoon（今天下午），thisevening=tonight（今晚），tomorrow（明天），tomorrowmorning(afternoon,evening)（明早，午，晚），thedayaftertomorrow（后天），nextSunday（下个星期天），nextweek(下周)，nextmonth(