"how many prizes does your best friend have?的语法是√还是×?

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"how many prizes does your best friend have?的语法是√还是×?

这个句子的语法是正确的,因为主语是your best friend,是单数,所以助动词要用does
对于这种句子的判断可以将特殊疑问句先转化为肯定句式,这样就容易多了.
比如,how many prizes dose your best friend have?就可以转化为
your best friend has how many prizes.
这样已转换就看出谁是主语,也就知道助动词应该用什么了.