要糖果 英语礼貌用法

May I have some candy?
用May礼貌一点.
要是Halloween小孩儿要糖用trick or treats
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补充一下,让人家"give me"本来就不礼貌

can you give me some cand？？
更礼貌的说法：could you please give me some candy??

could you give some sugar