What do you have on wednesdays? What do you have on thursdays? 请问为什么周三周四后面要加SI like wednesdays 也为什么要加S,不加也能翻译啊,没见过这种形式,求助高手如果上面三句话，不加S的话，算不算错

what classes do you have on monday? what do you have for lunch on What subjects do you have on Saturday? what classes do you have on Friday? What subjects do you have on Monday? do,have,on,what,you,Thursdays What do you have on Thursdays是什么意思 what do you have on fridays? 回答 what classes do you have on thursdays? (do on have you What Tuesdays)造句 What do you have on Thursdays是什么意思 what do you have on wednesday (中文) What do you have on Monday morning? what do you have on Monday?中文 what do you have on Monday?中文 what lessons do you have on Monday?可以用what subjects do you have on Monday? 应该是what do you have on Monday?还是what do you have on Mondays? “you do on have mondays you what” 连词成句