why does the difference between American and British English exist? Because they have been seperated by geography and history, thus they have developed along different paths the same way Portuguese in Brazil is different from Portugues in Portugual.
2017年11月14日
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Could you please clarify the question.
2017年11月13日
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I would like to know the difference between them. I think I could not express myself correctly.
2017年11月14日
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As Nick suggested, your question doesn't really make sense. "Why does something exist?" is a very philosophical question!