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1.一般用法：
He is a student, isn't he?
He isn't a student, is he?
(1) “have to, had better, used to”要用下列方式反问：
He has to finish the work, doesn't he?
They used to smoke, didn't / usedn't they?
You'd better get up immediately, hadn't you?
(2) “has, have”作为助动词和实意动词，反问形式不同。
We have done all the work, haven't we?
You have some time, don't you?
2. “seldom, barely, hardly, scarcely, few, little” 语意本身是否定，因此反意问句应为肯定形式。
She seldom comes to visit us, does she?
He hardly knew it, did he?
3.当主句为祈使句，反意问句提出要求，命令应用 “will you”
Do it at once, will you?
但如表示邀请，劝告，反意问句用 “won't you”
Have a cup of tea, won't you?
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