'happy classes' is correct and usable in written English.
You can use it to describe classes that bring joy, contentment, or satisfaction. For example, "The students enjoyed their time in the happy classes with their favorite teacher."
A happy class of southerners flaunts its new wealth without giving a damn.
He is also the happy class warrior, the smoothest divisive force in politics today.
However, the recognition accuracy for the happy class is about the chance level.
When US Senator Amy Klobuchar, '85, attended the University of Chicago Law School, she and her classmates were known as "the happy class"—a nickname they initially assumed was a complimentary acknowledgement of their fondness for social events and their efforts to reinvigorate the Law School Musical.
(Stacey Anderson) Class Actress (Thursday) The hook-happy Class Actress, led by the snappy Elizabeth Harper, cast the synth-heavy Anglophile spell of New Order or a much, much more amiable Morrissey.
Thus the course appears to foster the students' sense of autonomy, competence, and relatedness, resulting in them being more productive (learning the material, participating actively in class) and happier (class morale and student feedback about the course).
You remember Ben: the monster born to a determinedly happy family in middle-class England, an ugly, murderous goblin, all muscle and appetite.
This novel catches up with the title character, a hideous goblin born to a happy family in middle-class England, when he is 18 and looking a musclebound 40.
It's a snap of the archetypal happy, middle-class family, of ambitions, albeit late, fulfilled.
I was lucky enough to have both parents around who were really loving, and two younger brothers, and we were a happy, working class family.
