if和whether的區(qū)別含講解+習題+答案

1、If和whether的區(qū)別if和whether都可譯為“是否“二者引導賓語從句時通常可以互相替換口語中多用if代替whether.例如：Askifwhetherheplanstocometothemeeting.而以下幾種情況中只能用whether:1.強調(diào)兩方面的選擇特別是句中有not時.如：Letmeknowwhetheryoucancomenot.2.賓語從句前置時.如：WhetherthisistrueIcantsay.3.引導

2、主語、表語、同位語從句時.如：Whetherthefootballgamewillbeplayeddependsontheweather.（主語從句）Thequestioniswhetherhecandoit.（表語從句）Thequestionwhetherweshouldgowiththemmustbedecidedatonce.（同位語從句）4.在介詞之后作介詞的賓語時.如：Ihaventsettledthequestionofwh

3、etherIllgobackhome.5.在不定式前與不定式一起組成詞組時.如：Whethertogostayisstillaquestion.6.在discussdecide等動詞后作賓語時.如：Wediscussedwhetherweshouldgotherebyplane.值得注意的是：if還可以引導條件狀語從句是“假如；如果“之意而whether可以引導讓步狀語從句是“不管；無論“之意.如：Ifyouaskhimhewillhe

4、lpyou.Ishallgowhetheryoucomewithmestayathome.一、if或whether引導賓語從句時作“是否”講常放在動詞ask、see、say、know和findout等后面.一般情況下兩者常可換用在口語中多用if.如：例1Nobodyknowswhether(if)itwillraintomrow.沒有人知道明天是否下雨.例2Lucyaskedwhether(if)theyhadacottonsweate

5、r.露西問他們是否有棉制的羊毛衣.二、if或whether引導賓語從句時要注意三個方面即連詞、語序和時態(tài).1if或whether不能和that或其它連詞（副詞）同時使用也不能省去.如：例3我不知道他今天是否會來.[誤]Idon’tknowthatif(whether)hewillcomeheretoday.[正]Idon’tknowif(whether)hewillcomeheretoday.例4他走過來看看貓是否出了毛病.誤]Heca

6、metoseewhatif(whether)therewaswrongwithhiscat.[正]Hecametoseeif(whether)therewaswrongwithhiscat.2if或whether引導的賓語從句時雖具有疑問意義但從句語序應用陳述句語序.如：例5DidyouknowthewaytothehospitalTheoldwomanaskedme.Theoldwomanaskedme.if(whether)Ikne

7、wthewaytothehospital.老婦人問我是否知道去醫(yī)院的路.12)Itisunknown_________hewillcome.13)Idontknow_________theywillcometohelpus.14)Iamnotcertain___________thetrainwillarriveontime.15)____________thenewsistrueremainsaquestion.16)Whatwewa

8、nttoknowis___________hewillcometospeaktoustomrow.17)Thequestionis___________theycantakeouradvice.18)Letmeknow_____________youcan’tmeetmeatJacksonThroopStreetsWednesdayafternoonattwoo’clock.19)Wewerediscussing__________we

9、shoulddiscussthebusinesswiththem.20)Thequestion__________wellbuildanotherlecturehasntbeensettled.21)Thequestion____________hellcomeisunknown.22)Tellme__________itisnotgoingtorainplease.23)Idon’tcare________hedoesn’tshowu