1、What do you do on Mondays?与What do you do on Monday?2、What do you have on Mondays?与What do you have on Monday?哪句正确?加与不加有什么区别?这两句在小学英语中是有S的.一个是说星期一做什么?一个是说星期一上什么课?书中有S,但试卷上有的不用S.通常用不用S呢?