he say:mondayt and friday is he favorite days对吗?

问题描述:

he say:mondayt and friday is he favorite days对吗?
He says ;Monday and Friday is he Ffavorite day?
为什么是DAYS呢

咋的了?
这句话是这样的He says that Monday and Friday are his favorite days.用says 是因为he 是第三人称单数,用days 是因为是两天.