疑问句不对Does he does his homework after supper?
改成：Does he do his homework after supper?
原因：一般疑问句要把be动词提前,如果文中没有,就用do,does,did
但用do,does,did时,已经把第三人称单数体现,所以,要用动词原形do
否定句不对He doesn't his homework after supper
改成：He doesn't do his homework after supper
原因：doesn't 只是否定所描述的内容,而不是表示所否定的内容,延用修改句中的do
在前面加上否定词doesn't