It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't

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Itmustbeyours.改为否定句怎么改啊?是用mustn''tbe还是用can''tItmustbeyours.改为否定句怎么改啊?是用mustn''tbe还是用can''tItmustbeyours.

It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't
It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't

It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't
It may be yours