why don't british authors use words

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why don't british author's use the words sitting or standing? they will use sat or stood instead. for example, in the usa we would say he is sitting in the kitchen whereas the british would say he is sat in the kitchen. and the british would say he is stood in the kitchen. if i did that in school, my teachers would have had a fit. i guess it is just the difference between british and american english. just curious as to why.

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