This document lists common mistakes made when speaking English and provides corrections. It addresses mistakes such as using "advises" instead of "advise" when thanking someone, using "son in law" instead of "son-in-law", saying "look at me in the mirror" instead of "look at myself in the mirror", and using "opened" instead of "open" to describe a shop. It also asks which is correct, "I know him good" or "I know him well", and "On what you are here" or "What are you here for?".