kate with his mother ___(fly) a kite in the park on sundays

问题描述:

kate with his mother ___(fly) a kite in the park on sundays

flies.
还是使用三人称单数的动词形式,因为主语还是Kate,不是和她妈妈两个人.
原句可改为:
kate flies a kite with his mother in the park on sundays.
Kate and his mother 才是非三人称单数的主语.
可以再问