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.