上课是：have classes 为什么句子时就变成了:they are having a class如果你说他是单数句但是class要加es?我记得老师说过,而且还很简单可是我忘了!

上课是用 have class还是have classes具体语境是她每天除了上课就是上网 他正在上课吗是Is he having classes?还是Is he have a class?为什么打错了，第二个是Is he having a class 正在上课 或者 在上课,用英语怎么说?上课 怎么说?是Have a lesson还是Have classes...还是另有其他说法? have school,have classes是有课的意思,可不可以指上课 We( ) have classes ( )Sunday morning. 我们星期天早上不上课 我们下周将不上课.We () () () ()have ()classes next week. 我们下周将不上课.We () () () ()have ()classes next week. 他们让孩子上课是对的 英语they are right about letting their children have classes 有没有语法错误 上课是：have classes 为什么句子时就变成了:they are having a class如果你说他是单数句但是class要加es?我记得老师说过,而且还很简单可是我忘了! We have four classes in the morning.four划线变成how many classes do you have in the morning.中DO是为什么 下周你们打算不上课,用上you,are ,have,classes,week,aren't what classes does jack have on that day是what classes does jack have on that have a class,have classes哪个是正确的?急. 句子补充 We have classes from Monday____Fri句子补充We have classes from Monday____Friday（中文：我们从周一上到周五上课） Tom ()(not have)any classes on sundays.填什么?为什么? Bob and his classes are not have classes at school中文意思是 have classes求中文 have classes中文是什么