1 那个老师正在给学生上数学课
That teacher is having a maths class with the students
2 我们正在上物理课
I am taking a biology class.
3 你几点下课 / 几点放学 ?
When is the class over?school over?
4 再上两节物理课,我们就该放学了.
School will be over after another two physics classes
5 那个男人,每隔一周就会到这个图书馆
That man comes to this libary every other week.