I noticed in a TV show that the phrase "I want a refund" is pronounced like [I wanna refund]. I think the /t/ is dropped and /n/ is blended into the vowel. But how do Americans differentiate between wanna (want a) and wanna (want to) in this situation? Do they differentiate by the stress position on the word 'refund'?
I want a refund [sounds like: I wanna refund] refund used as a noun
I want to refund [sounds like: I wanna refund] refund used as a verb