Detailed History of the Formation of the English Language

Because the English underclass cooked for the Norman upper class, the words for most domestic animals are English (ox, cow, calf, sheep, swine, deer) while the words for the meats derived from them are French (beef, veal, mutton, pork, bacon, venison).
The Germanic form of plurals (house, housen; shoe, shoen) was eventually displaced by the French method of making plurals: adding an s (house, houses; shoe, shoes). Only a few words have retained their Germanic plurals: men, oxen, feet, teeth, children.
French also affected spelling so that the cw sound came to be written as qu (eg. cween became queen).
It wasn't till the 14th Century that English became dominant in Britain again. In 1399, King Henry IV became the first king of England since the Norman Conquest whose mother tongue was English. By the end of the 14th Century, the dialect of London had emerged as the standard dialect of what we now call Middle English. Chaucer wrote in this language.
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