Yes, you are right - this is a matter of British and American English: In American English, the forms usually are: get (infinitive) got (past tense) gotten (past participle) while in British they are: get (infinitive) got (past tense) got (past participle) The "inappropriate" use you are referring to is certainly the one when "get" is used together with have: In British English, have in present tense is usually followed by the past participle of get: I have got a car. / Have you got a car? So in American English, the use of "got" together with have is generally said to be inappropriate, while in British English this is correct and has even become standard.
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AnonymousI'd also like to know.Hi Anon