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时间:2020-06-19
《whether和if引导的从句.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、whether与if一、相同之处。1.whether和if常置于see,ask,say,learn,tell,wonder,doubt,findout,beuncertain/doubtful/benotknown等动词之后引导宾语从句,通常可以互相替换,口语中多用if代替whether。在非正式的写作中,可以使用if或whether两个词来表达不定性,两者都算标准。例如:Weshallsoonlearnwhether/ifitistrue.Heaskedmewhether/ifIcouldhelphim.Iwanttoknowwhether/ifheli
2、vesthere.Askif/whetherheplanstocometothemeeting.我的桌面上“我的电脑”和“我的文档”都成...... 2.whether和if都可用it作形式主语从句中。如:it'suncertainwhether/ifhe'llcomethisevening. 3.在beuncertain/doubtful/benotknown之后,常用whether引导宾语从句,有时也可以用if,如:Weareuncertainwhether/ifMarywillcome. 二、不同之处。1.whether可置于句首引导主语从句,
3、if则不能。如:Whetherthe2000OlympicGameswillbeinBeijingisnotknown.Whetherthefootballgamewillbeplayeddependsontheweather.Whetherhewillcomeisstillaquestion.若在句首使用形式主语it,而将主语从句放在句末,则有时也可用if来引导。如:Itwasnotknownwhether/ifhewouldcome.2.whether可引导表语从句,if则不能。如:Thequestioniswhetheritisnotworthdoi
4、ng.Thequestioniswhetherhecandoit.Thequestioniswhetherweshouldgoonwiththework.3.whether可引导同位语从句时,if则不能。如:Thequestionwhetherthestudentsansweredcorrectlyshouldbedecidedbytheteacher.Thequestionwhetherweshouldgowiththemmustbedecidedatonce.4.宾语从句置于句首表示强调时,用whether,不用if。如:Whetherthisistr
5、ue,Ican'tsay.Whetherheissingle,Idon’tknow.5.在介词之后只能用whether引导宾语从句,而If则不能。如:Successdependsonwhetherwemakeenougheffort.Ihaven'tsettledthequestionofwhetherI'llgobackhome.Itdependsonwhethertheletterarrivesintime.IworryaboutwhetherIhurtherfeelings.6.在动词不定式之前只能用whether,而if不能。如:Pleasetel
6、luswhethertogoorstayhere.Whethertogoorstayisstillaquestion.I’mnotsurewhethertostayorleave.Ididn’tknowwhethertolaughortocry.7.在某些动词(如discuss,decide)之后,只能用whether,而不用if引导宾语从句。如:Wediscussedwhetherweshouldclosetheshop.(虚拟语气)Wediscussedwhetherweshouldgotherebyplane.(虚拟语气)Wediscussedwhe
7、therweshouldholdameeting.(虚拟语气)8.在引导否定概念宾语从句时,只能用if,而不用whether。如:HeaskedmeifIhadn'tfinishedmywork.注:doubt否定句用that引导。因为don’tdoubt意为相信,不怀疑,if是否表示疑虑。9.与or连用分别引导两个从句时,或强调两方面的选择,特别是句中有ornot时用whether,不用if。如:Idon’tknowwhetherheiswrongorsheiswrong.Letmeknowwhetheryoucancomeornot.Idon’tkno
8、wwhetherhewillwinornot.Iwillwrite
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