According to Oxford English Corpus, here are the top-25 most commonly used words in the English language:

The / Be / To / Of / And

A / In / That / Have / I

It / For / Not / On / With

He / As / You / Do / At

This / But / His / By / From

This list is based on an Oxford English Corpus analysis of over a billion words, and represents one study done by Oxford Online, associated with the Oxford English Dictionary. This source includes writings of all sorts from literary novels and specialist journals to everyday newspapers and magazines, and from U.K.’s Hansard to the language of chatrooms, emails, and weblogs. (The Reading Teachers Book of Lists claims that these first 25 words make up about one-third of all printed material in English.)

SOURCE:  Wikipedia 

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