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Standard English is a general term for a form of written and spoken English that is considered the model for educated people by native English speakers. There are no set rules or vocabulary for "Standard English" because, unlike languages such as French or Dutch, English does not have a governing body (see Académie française, Dutch Language Union) to establish usage. As a result, the concept of "standard English" tends to be fluid. Various regional and national "standards" exist.
The issue is particularly complicated because English has become the most widely used language in the world, and therefore it is the language most subject to alteration by non-native speakers.