I have on class on Tuesday mornings.请问为什么morning后要加s?

I have class __________.in .on.at.by.选哪个 class I sunday have morning on English 组成句子 I have English class on Mondays.(问句?） i don't have bad purpose on class,have,on,9:00,often,weekend (连词成句)class,have,on,9:00,often,weekend,I I have on class on Tuesday mornings.请问为什么morning后要加s? I have English class on Tuesday.为什么没有an或是class用复数呢? I mean ---------(have) a class meeting on Monday afternoon.在空上填have的形式. I want to there very much,but I must have a s____ class on Thursday evening. Isn`t it great?Our class is going to have a party on Children`s day! I don't have any time on other activities改错 They have on class on sunday这哪里不对 I mean ___ class meeting on Monday afternoon A.haI mean ___ class meeting on Monday afternoonA.have B.to have C.having D .to having _________,I have sports on the playground.A.After the class B.After class C.In class D.In the class I didn't attend to any training class but learned it on my own. Sorry,I'm late for class.There's too much t( ) on the road Two days.(4)______________.I have an English class on class on Friday.英语高手请进补充：上一句是你有几天上英语课 I don’t have any lessons on Saturday.（改为同义句）I don’t( )( )school on Saturday.