没有第三人称变化,因为have 在这里是使役动词,使役动词的用法是 have sb.do sth.这里的do是指动词原形,没有人称和数的变化.比如：Please don't have her clean the dirty room.意为“不要让她打扫这个脏房间.”英语里类似的使役动词还有 let,make等.
have sb.do sth.后面的DO有第三人称的变化吗,为什么
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