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Invading tribes(Angles-Saxons-Juters) spoke similarly.
Old English didn't sound like or resemble English nowadays. -
Norman Invasion in 1066 brought about a linguistic class division:
a. Upper Classes spoke French
b.Lower Classes spoke German
c. Monks & Scholars spoke Latin -
a. The Great Vowel Shift (vowels pronounced shorter and shorter)
b.Invention of printing-Standardisation of the English language/Fixation of grammar and spelling/Publication of the first dictionary -
More words created due to the Industrial Revolution & expansion of the British Empire.