good morning ,class student 还是class students?

一般老师上课说good morning class，或者good morning boys and girls，
直接称呼学生students不太合适

应该是class students, 因为学生是复数，所以加s.或者可以说：Good moring every one.

外国人老师都是说
Good morning, class

good morning ,class 就可以了