Someone___is_knockingatthedoornow,__isn\'the____?不定代词当陈述部分的主语是(1)用one时,后面的疑问句可用one/he.(2)everything,anything,nothing,something时,附加疑问句中主语用it不用they(3)this,that,或those,these时,附加疑问句中主语用it和they.(4)everyone,everybody,someone,somebody,anyone,nobody等,附加疑问句中主语一般用he(书面语)/they(口头语).(5)不定式,动名词,其他短语,附加疑问句中主语一般用it。(6)在therebe句型中,附加疑问句中主语一般用be/情态动词/助动词there。
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