The document discusses the influence of French on the English language following the Norman conquest of 1066. It led to many changes in English vocabulary, with thousands of French words being introduced, especially those relating to more skilled jobs, cooking animals, and formal language. French also influenced English pronunciation, spelling, and grammar. The inflectional system largely disappeared and was replaced by final "schwa" sounds on many words. Overall, the Norman conquest had a profound impact on the development of the English language.