Why are my teachers so lazy

Good Question.

Explanation:

I think it's because they know students are gonna be cheating because of this virus stuff so they just don't try anymore

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.