This document summarizes key aspects of Middle English grammar and language from the medieval period in 3 sentences or less: Middle English exhibited significant changes from Old English in its nouns, verbs, pronouns and orthography due to Norse and French influences over time. Regional dialects developed differently across England, leading to variation in vocabulary, pronunciation and grammar. By the late 14th century, the London dialect began to become more standardized due to its use by royal administrators, though regional dialects still varied greatly.