Gimme, gotta, wanna, gonna, etc are just orthographic representations of reductions/contractions , as far as I know.
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Abolfazl Moradpoor#1 - Unreleased T, or stopped T, or glottal stop. - You can't take it away
1 - I'm not good at filing and typing
2 - I don’t like doing sales work
3 - I can't stand working from nine to five