You can use negative statements with positive question tags to make requests.

由否定陈述句加肯定简短问句构成的反意疑问句可用以提出请求.

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You use some question tags to make imperatives more polite.

反意疑问句也用以使祈使句更礼貌.

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You use positive statements with positive question tags to show reactions.

由肯定陈述句加肯定疑问短句构成的反意疑问句可用以表达回应.

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