宾语从句引导词如果从句是陈述句,引导词用that(that在口语或非正式文体中常省略);如果从句是一般疑问句,引导词用if/whether;如果从句是特殊疑问句,引导词用由疑问词转换而来的疑问代词/副词。一)以that引导的宾语从句,主要用来引导陈述句形式的宾语从句,that可以省略。Iknow(that)heisaCanadianathlete.Doyouthink(that)thechildrenneedtowriteasong?Mariasays(that)shedoesn’tliketheuniforms.Shetoldme(that)shewouldliketogowithus.二)以whether或if引导的宾语从句,主要用来引导一般疑问句意思或选择疑问句意思的宾语从句。whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用。如:Iwonderif/whetherIcangetsomeadvicefromyou.Askhimwhether/ifhecancome.但在有些情况下,只能用whether,不能用if:1.whether引导的从句常可以与连词or或ornot直接连用,而if一般不能。如:正:Letmeknowwhetheryoucancomeornot.误:Letmeknowifyoucancomeornot.2.当宾语从句提到句首时,只能用whether引导,而不能用if。如:正:Whetheritistrueornot,Ican’ttell.误:Ifitistrueornot,Ican’ttell.3.whether可以引导带to的不定式,if则不能。如:正:Idon’tknowwhethertoacceptorrefuse.误:Idon’tknowiftoacceptorrefuse.4.whether及其引导的成分可放于介词之后,作介词的宾语,但if不能。如:正:IworryaboutwhetherIhurtherfeelings.误:IworryaboutifIhurtherfeelings.5.whether可以引导从句,作主语、表语或同位语,而if不能。如:正:Itwasuncertainwhetherhewouldcome.误:Itwasuncertainifhewouldcome.6.若用if会引起歧义时,则用whether。Pleaseletmeknowifyoulikethebook.可理解为:a.Pleaseletmeknowwhetheryoulikethebook.b.Ifyoulikethebook,pleaseletmeknow.三)疑问词引导的宾语从句疑问代词:what、whom、who、whose、which疑问副词:when、where、why、how例句:1、Thebookwillshowyouwhatyoumustdo.2、Iwanttoknowwhomadethetoy.3、Pleasetellmewhosebookthisis.4、Iwonderwhomyoulike.5、Pleasetellmewhereyouarefrom.