Here is an example of a brief cover note for your email Dear Prof......[ insert the surname] Please find attached my student cover sheet together with my assignment/essay on " ".[ insert the title/topic of your assignment] due on [ date] If there are any problems with opening up this attachment, please let me know and I will resend it. Yours sincerely, Ayim [ insert your surname]

Universities have special setups for emailing assignments. There is nothing to write. Just go to the university website.

Is your assignment a separate document file? Like a .doc, .txt, or .pdf, in that case, most email clients will have a button where you can browse for that on your computer.