class,classes 课程

class,classes 课程 "class begin"还是"classes begin"? after class 还是 after classes don't have class还是classes We have no (class/classes) on Sundays. class strat 还是classes strat 或class strats 是Class begin.还是Class begins.还是Classes begin.为什么? 为什么classes begin中classes变class时,begin变begins all the ____(class,classes ,student,students)are _____(frien How many _____ (class,classes)do you have every day? begins class和classes begin为什么加s? 上课是用 have class还是have classes