Genteel students should write Leave Letter in advanced when they will unable to come to class. (but not in Facebook, but to my official MFU email account)
2. Absence without proper notice to related subject instructor is an insolence to the teachers.
3. "Physically Present, but Mentally Absent in class is a double waste of time and energy.
P.S:
I'm not a 24/7/31/12 receptionist, henceforth, please don't ask me things happened in the past classes in which you were absent without notice as it is an insolence to me. I'm not here to answer for everything you didn't pay attention and respect. In case if you really paid full attention and still can't get well of the lessons or teaching, I am always here to help or assist you happily.