They are doing their homework.(变成否定句)

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Theyaredoingtheirhomework.(变成否定句)Theyaredoingtheirhomework.(变成否定句)Theyaredoingtheirhomework.(变成否定句)t

They are doing their homework.(变成否定句)
They are doing their homework.(变成否定句)

They are doing their homework.(变成否定句)
they aren't doing their homework