he usually---(help)his mother do some housework on sundays.

问题描述:

he usually---(help)his mother do some housework on sundays.

正确的答案是:
He usually--helps-(help) his mother do some housework on sundays.
这里用第三人称单数的一般现在时形式
这个句子的意思是:
他通常在星期天帮助他的母亲做家务.