如果是一个单独的句子,当然是:Please don't do sth.
因为
祈使句的否定句就是如此。
如:Please don't talk in class.
当然,如果是用在句中,也有please not do sth,如:
Can/Could/Will/Would you please not do sth?
请问你可以不要...好吗?
再如:Would you please not talk in class?
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