The children must be back at ten o‘clock(变否定句)

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The children must be back at ten o‘clock(变否定句)

The children needn't be back at ten o‘clock

The children needn't be back at ten o'clock

The children don't have to be back at ten o'clock.或者
The children needn't be back at ten o'clock。

the children need not back at ten o'clock 含有情态动词的句子变否定句都是把情态动词变成needn't