Communicating with a Professor, Good Vs. Bad Examples
Bad:
Yo teach, I wasnt in class. its whatever i heard we didnt do anything important c u tom.

Good:
Dear Dr. Walts,
I am not going to be able to attend your 10-10:50 class this Wednesday February 4th, I have already read the syllabus and completed such assignments, I have also been in contact with another student from class in order to ensure that I receive all the notes and handouts.
Thank you and see you soon,
Morgan Surma