Tom is doing his homework.变成否定句怎么变?

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Tomisdoinghishomework.变成否定句怎么变?Tomisdoinghishomework.变成否定句怎么变?Tomisdoinghishomework.变成否定句怎么变?Tomisno

Tom is doing his homework.变成否定句怎么变?
Tom is doing his homework.变成否定句怎么变?

Tom is doing his homework.变成否定句怎么变?
Tom is not doing his homework