I like mondays.we have art class.找出一处错误

I like mondays.we have art class.找出一处错误
I like mondays.we have art class.找出一处错误

I like mondays.we have art class.找出一处错误
Monday不要S

我觉得是给class加es。。我们喜欢周一，因为我们有艺术课，这是通指的说法。。