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

问题描述:

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

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

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

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