who,whose,which,what作主语时,通常接一个肯定动词而不是疑问动词:
Who pays the bills?
谁付帐?(肯定动词)
Whose/Which horse won?
谁的/哪匹马赢了?(肯定动词)
What happened?/What went wrong?
出了什么事?/出了什么毛病?(肯定动词,可能的回答如We missedthe train/had an accident我们误了火车/出了事故。)
但who,whose等后跟be+名词或人称代词时,要用疑问动词:
Who are you?
你是谁?
Whose is this?
这是谁的?
What is that noise?
那噪音是怎么回事?
who,whose等作动词或介词的宾语时,整句当然需要用疑问动词。
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