I've got to
I gotta
/aɪ ˈɡɑɾə/ReductionT sounds
In real speech
What happens to the sounds
've is barely heard, got to becomes gotta, and the t between vowels sounds like a quick, soft “d” (flap T) → “GOD-da”.
When to use it
Casual way to talk about obligations: I gotta go. In a work email use I need to or I have to.
Casual → formal
Slang
I gotta
Neutral
I have to
Formal
I must
Sound notes
Reduction: unstressed words get squeezed, and their vowels turn into the neutral sound /ə/.
