tom has finished his homework doesn't heTom has finished his work,_____he?为什么用 hasn't什么时候用doesn't?讲解仔细点例题

分类: 作业答案 • 2021-12-20 02:04:16

问题描述：

tom has finished his homework doesn't he
Tom has finished his work,_____he?
为什么用 hasn't
什么时候用doesn't
?讲解仔细点
例题

答

此处的has为助动词，所以做否定句及疑问句时，用has

答

因为前面是现在完成时态,有助动词HAS,故要用hasn‘t,不能用doesn't.
比较：Tom finishes his work,doesn't he?