We must go to bed before nine o'clock.（一般疑问句）
must we go to bed before nine o'clock？
我们必须9点之前上床睡觉吗？
good luck
Dose we must go to bed before nine o’clock
Must we go to bed before nine o'clock？
Does she have to go to bed before ten o'clock?
改为一般疑问句是：Must we go to bed before nine o'clock？因为must是情态动词，所以要把must提前
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