The Gist of the Email

From me to my calculus class:

I'm letting you know via email that we're doing groupwork in class tomorrow and I'm sending the problem sheet as an attachment because I want the people who will be a drag on the activity to stay home.

From a desperate student to me:

I dropped astronomy because it was too hard, and now I want you to let me into a math class way after the add deadline because I took calculus in high school, so I already know everything about math.