I learned all the Latin abbreviations in the 8th grade, and I use them as a shorthand for notes to myself. Cf. is one of my favorites. Or "et. al.", when I want to mean there is more than one person in that list.
You must've gone to Catholic school to learn Latin in 8th grade. Public schools just usually had Spanish, French, Italian, german, etc.
If you expect us to take you seriously, you must use those terms in a grammatically correct sentence, young man!
