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