I want to
I wanna
/aɪ ˈwɑnə/Reduction
In real speech
What happens to the sounds
The two t sounds (want + to) merge and drop after n, and to weakens to /ə/: want to → “WAN-na”.
When to use it
With friends and colleagues. After he/she it's he wants to — never “he wanna”.
Casual → formal
Slang
I wanna
Neutral
I want to
Formal
I would like to
Sound notes
Reduction: unstressed words get squeezed, and their vowels turn into the neutral sound /ə/.