Well, it is not a lexical 'construction', if I take your meaning. It is simply a way to spell the casual pronunciation, and could be used to represent the words, want to , in transcribing any spoken dialect that pronounces it that way. That pronunciation is certainly common in the US.
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Who knows origin of word "wanna" (=want to)? I mean is it american construction or english native one?'Wanna' entered the English language already sometime between 1870 and 1899. It is heard in Britain just like in the United States.
My Oxford dictionary says that WANNA is american english word (or contraction), GONNA also is AmEn, but AIN`T isn`t.Which Oxford dictionary are we talking about? There are dozens of them.
What is more, 'gotta' is labelled colloquial, whereas 'gonna' is labelled unstandard.Curioser and curioser. Thanks very much for the information. Which Oxford is yours, indeed?-- My Shorter Oxford (granted, it's a 3rd edition) has no entries for any of those.