They must go home now改成一般疑问句 特殊疑问句 和否定句

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They must go home now改成一般疑问句 特殊疑问句 和否定句

Must they go home now?
What must they do now?
They needn't go home now.(一般用needn't否定,表示他们现在不必回家.而mustn't 则表示他们不许回家,意思完全不一样.)

Must they go home now?