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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Use imperative mood in procedures.

对过程使用祈使句.

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This applies to all forms of sentence, including statements, imperative and interrogative forms.

这一方法适用于所有句式, 包括陈述句 、 祈使句和疑问句.

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