你这是真正的语言。
in class,指地点比较合适。someone is in class。相当于someone is in classroom.
on class,指时间比较合适。someone is on class.相当于someone is busy, not free, is on class.
个人看法,仅供参考。
on class指在种类上。
on-class teaching才是指课堂教学。
in class指在课堂上;上课中。
practice on the class随堂练习。
discuss on the class随堂小议。
in class 是正确的。
没有on class 的说法。
in class 在班级里在课堂上。。。比如说上课做笔记,班上有几个男生女生:
students should take notes in class
there are 4 girls and 5boys in class
on class貌似从来没见过~~