问题描述：
you mustn't smoke here(祈使句')谢谢了,
you should be quiet.祈使句') why not have a rest?祈使句') let us go swimming.（改为反疑问句） let's play a game..（改为反疑问句）
you should be quiet.祈使句') why not have a rest?祈使句') let us go swimming.（改为反疑问句） let's play a game..（改为反疑问句）
问题解答：
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