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The history of American English started from 1620,which has a close relationship with the colonial history in America, because it is basically the development of the British English of the 17th Century.It keeps some features of British English.The various diferences in cultures of the UK and the USA,esp.in the pronounciation, have caused students great troubles:Some students know little about the British and American cultures ,and others knew only part of the pronounciation of both language -not enough to form the whole concept of Engligh language.

The American English history began in 1620, has the close relationship with US's immigration history, because he basically was the 17th century Britain English in Americas' development, he retained British English some characteristics. As a result of UK-US culture's many differences, in the pronunciation difference, causes the student to have some shock symptom particularly, some schoolmates understand very little to the