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Why not speak Chinese?
Why don't you speak Chinese?
Could you speak Chinese?
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why
used in questions to ask the reason for or purpose of sth
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speak
(not used in the progressive tenses ä¸ç¨äºè¿è¡æ¶) to be able to use a particular language
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could
used to politely ask sb to do sth for you
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望采纳!