he does his homework at seven o'clock.改为否定句

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hedoeshishomeworkatseveno''clock.改为否定句hedoeshishomeworkatseveno''clock.改为否定句hedoeshishomeworkatseveno''

he does his homework at seven o'clock.改为否定句
he does his homework at seven o'clock.改为否定句

he does his homework at seven o'clock.改为否定句
he doesn't do his homework at seven o'clock ; 原句中的does是动词,改为否定后恢复为原来的do ,do前加入助动词does的否定式 doesn't

he doesn't do his homework at seven o'clock.

he didn't do his homework at seven o'clock.