It was in the Middle Ages that the everyday vocabulary of English was affected most deeply by borrowing from other languages. ‘age’, ‘air’, ‘cause’, ‘city’, ‘idea’, ‘join’, ‘material’, ‘poor’, ‘suffer’, ‘tax’. Nearly half of the 1,000 most frequently occurring words in modern written English have come into the language from French or Latin, mostly in the period from 1066 to 1500.