The various dialects of English differ from the standard language in rough proportion to how long they have had a separate identity. Languages need time to develop in their own directions and take on their own features. For this reason Scottish and northern English are generally more different from standard Southern British English than, say, Australian and New Zealand English are.
Over the last 400 years English has spread to all continents and in each country it has taken on its own peculiarities, creating new words to describe indigenous features of landscape, wildlife, and plantlife, and absorbing words from the local languages.
Nevertheless, the vast majority of words in the various dialects are common to all forms.
They belong to what is known as ‘World English’.
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