If 和whether的区别 (含 讲解+习题+答案)

If和whether的区别if和whether都可译为\"是否\",二者引导宾语从句时通常可以互相替换,口语中多用if代替whether.例如：Askif/whetherheplanstocometothemeeting.而以下几种情况中,只能用whether: 1.强调两方面的选择,特别是句中有ornot时.如： Letmeknowwhetheryoucancomeornot. 2.宾语从句前置时.如： Whetherthisistrue,Ican\'tsay. 3.引导主语、 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 语、同位语从句时.如： Whetherthefootballgamewillbeplayeddependsontheweather.（主语从句） Thequestioniswhetherhecandoit.（表语从句） Thequestionwhetherweshouldgowiththemmustbedecidedatonce.（同位语从句） 4.在介词之后作介词的宾语时.如： Ihaven\'tsettledthequestionofwhetherI\'llgobackhome. 5.在不定式前与不定式一起组成词组时.如： Whethertogoorstayisstillaquestion. 6.在discuss,decide等动词后作宾语时.如： Wediscussedwhetherweshouldgotherebyplane. 值得注意的是：if还可以引导条件状语从句,是\"假如；如果\"之意,而whether可以引导让步状语从句,是\"不管；无论\"之意.如： Ifyouaskhim,hewillhelpyou. Ishallgo,whetheryoucomewithmeorstayathome. 一、if或whether引导宾语从句时,作“是否”讲,常放在动词ask、see、say、know和findout等后面.一般情况下,两者常可换用,在口语中多用if.如： 例1Nobodyknowswhether(if)itwillraintomorrow.没有人知道明天是否下雨. 例2Lucyaskedwhether(if)theyhadacottonsweater.露西问他们是否有棉制的羊毛衣. 二、if或whether引导宾语从句时,要注意三个方面,即连词、语序和时态. 1if或whether不能和that或其它连词（副词）同时使用,也不能省去.如： 例3我不知道他今天是否会来. [误]Idon’tknowthatif(whether)hewillcomeheretoday. [正]Idon’tknowif(whether)hewillcomeheretoday. 例4他走过来看看猫是否出了毛病. 误]Hecametoseewhatif(whether)therewaswrongwithhiscat. [正]Hecametoseeif(whether)therewaswrongwithhiscat. 2if或whether引导的宾语从句时,虽具有疑问意义,但从句语序应用陈述句语序.如： 例5Didyouknowthewaytothehospital?Theoldwomanaskedme. Theoldwomanaskedme.if(whether)Iknewthewaytothehospital.老妇人问我是否知道去医院的路. 3if整理为word格式整理为word格式整理为word格式或whether引导的宾语从句应和主句的时态保持一致.即主句为一般现在时,从句用任一种时态；主句为一般过去时,从句则用过去时中的任一种时态.如： 例6Idon’tknowif(whether)hehascomehere.我不知道他是否来过这儿. 例7Tomaskedif(whether)Ihadreadthebook.汤姆问我是否看过这本书. 三、if和whether的区别： 1在动词不定式之前只能用whether.如： 例8Ican’tdecidewhethertostay.我不能决定是否留下. 2在whether……ornot的固定搭配中.如： 例9Iwanttoknowwhetherit’sgoodnewsornot.我想知道是否是好消息. 3在介词后,只能用whether.如： 例10Hisfatherisworriedaboutwhetherhelosehiswork.他的父亲担心是否会失去工作. 4宾语从句放在句首表示强调时,只能用whether.如： 例11Whethertheycanfinishtheworkontimeisstillaproblem.他们是否能准时完成这项工作还是个问题. 5用if会引起歧义时,只用whether.如： 例12Couldyoutellmeifyouknowtheanswer? 这句话有两种意思：“你能告诉我是否知道答案吗?”或“如果你知道答案,请告诉我,好吗?”.如用whether可避免歧义.if和whether专题Idon'tcare__________yourcarbreaksdownornot.Thisdependsupon_________wearedeterminedtodoit.Itdependson_________heisready.Iamnotinterestedin_________you'llcomeornot.Wehaven'tsettledthequestionof__________we'llrenewoursuppliesofcoalforfactory.Hedoesn'tknow_________tostayornot.Iamnotsure___________I'llhavetimetogowithyou.Shedoesn'tknow__________togetmarriednoworwait.Idon'tknow_________ornottheywillcomeforourhelp.Wediscussed__________weshouldmakeachangeinourplan.Heconsidered__________heshouldn'ttellherthesecret.Itisunknown_________hewillcome.Idon'tknow_________theywillcometohelpus.整理为word格式整理为word格式整理为word格式Iamnotcertain___________thetrainwillarriveontime.____________thenewsistrueremainsaquestion.Whatwewanttoknowis___________hewillcometospeaktoustomorrow.Thequestionis___________theycantakeouradvice.Letmeknow_____________youcan’tmeetmeatJacksonandThroopStreetsWednesdayafternoonattwoo’clock.Wewerediscussing__________weshoulddiscussthebusinesswiththem.Thequestion__________we'llbuildanotherlecturehasn'tbeensettled.Thequestion____________he'llcomeisunknown.Tellme__________itisnotgoingtorain,please.Idon’tcare________hedoesn’tshowup.Pleaseletmeknow__________youintendtocome.Letmeknow___________hehasleftforShanghai.整理为word格式整理为word格式整理为word格式if/whetherwhetherwhetherwhetherwhetherwhetherwhether/ifwhetherwhetherwhetherifwhetherwhether/ifif/whetherWhetherwhetherwhetherifwhetherwhetherwhetherififwhetherwhether友情提示：本资料代表个人观点，如有帮助请下载，谢谢您的浏览！整理为word格式整理为word格式整理为word格式