This document summarizes some of the key differences between American and British English usage. It discusses differences in the use of the present perfect tense, words like "just" and "yet", possession with "have" vs. "have got", the verb "get", vocabulary words like "color" and "flavour", prepositions like "on" and "at", past participles, and spelling conventions. The document is intended as a reference for conversation classes on differences between American and British English.