From an administrative assistant charged with writing up project memos to a freelance writer tackling a new website, grammar goofs, gaffes, and errs will make you, at best, look unprofessional and, at worst, worthy of a viral giggle. So check out this handy infographic from the writing gurus at Copyblogger:

Go directly to Copyblogger for a printable version—and while it’s probably not good office politics to leave a copy on your grammar-challenged office mate’s desk, don’t be afraid to print out a copy for yourself.