1.he usually does his housework at night.改为否定句
问题描述：
1.he usually does his housework at night.改为否定句
答
he never does his housework at night.
答
He never does his housework at night.
改变频率副词使句子变否定。
答
He usually doesn't do his housework at night。
do one‘s housework 是做某人的家庭作业
do是实义动词，（题目中因为主语是he所以用第三人称单数dose），变成否定句时，要借助助动词do，再根据主语是第三人称单数改成dose，再加上not 就可以了
答
He usually doesn't his housework at night.
答
否定句：He usually doesn't do his housework at night.
方法：因为主语是第三人称单数he,于是借助助动词does,且改为否定,也就是doesn't ,再放在实义动词do的前面.就可以了：）