u in up
u in pun
o in from
a in delta
"uh" when someoune says: "Uh, I don't know."
Those are {a} sounds.
Schwa is what You don't ever pronounce clearly.
Sometimes even English-speaking people fail to realize this problem,
the problem of so much different vowels.
English-learner: ...One feature of English that makes it wacky is the great number of vowels...
English-speaker: Why, we have only 5.
English-learner: Excuse me, but not exactly. You have 18.
English-speaker: No way! Let's see: 'a,' 'e,' 'i,' 'o,' 'u.'
English-learner: And could You tell me which one is the vowel in 'car?'
(Same with tenses - "Duh, 12? How come?")
mi'e xiLI,odor.