In which context do you use the stressed bʌt and when do you use the unstressed bət? How often is that? If you know about the website www.forvo.com, I think it's a shortcoming that speakers use only one of the two versions.

  • 1
    It's worse than that IMO, the t is usually pronounced as a glottal stop. – z7sg Ѫ Apr 17 '11 at 19:43
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    If you want to hear an unstressed but, you can listen to the expression slow but sure on www.forvo.com. – Peter Shor Jun 2 '11 at 19:13

Your question is related to phonology.

Usually all words have a stressed syllable, those who don't have such feature are usually monosyllables (they are typically function words or grammatical words/particles), and so they have a weak form and a strong form.

Those words are (I'll paste it from Wikipedia because I don't remember them all):

a, am, an, and, are, as, at, be, been, but, can, could, do, does, for, from, had, has, have, he, her, him, his, just, me, must, of, shall, she, should, some, than, that, the, them, there, to, us, was, we, were, who, would, you

As you can see, "but" is on the list. The pronunciations you listed for it, [bʌt] and [bət], are respectively the strong form and the weak form.

Now, I don't remember exactly all the cases (I should look back in my notes because I did this at university), but usually the weak form is used in normal speech, unless you emphasize it then you use the strong form. Another distinction is between "particle used at the end of the sentence" vs. "particle used before a noun", for example:

I found what I'm looking for. --> [fɔː(r)]
I'm looking for money. ---------> [fə(r)]

Look here if you want to hear the pronunciation. (Check the BrE one, it gives the idea better.)

  • Strangely, the BrE versions of "but" in Oxford dictionary give a better idea too – Theta30 Apr 17 '11 at 20:20
  • @Bogdan Lataianu: Sorry I couldn't understand your comment, what did you mean? – Alenanno Apr 17 '11 at 21:50
  • I said if you search the word "but" on the link you gave, the BrE version gives a better idea than AmerE. – Theta30 Apr 17 '11 at 22:10
  • Ah yeah yeah :) – Alenanno Apr 17 '11 at 22:21

The word is similar to a and the (ā vs. ə and ðē vs. ðə). The stressed bʌt tends to be used more when I am emphasizing that I am making a contrast:

I would go, but my parents won't let me. (whining teenager)

The unstressed bət is used more often when what I am saying is more important than the fact that there is a contrast:

...but I don't wanna go! (whining child)

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    I think the emphasis happens less often, so I would guess 80% of times the unstressed form is used. For "the", the percentage for the unstressed is smaller; this word is (mostly) stressed in a slightly different context-when it is before vowels. – Theta30 Apr 17 '11 at 19:47
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    There's a limit to how many elements can be sensibly stressed in an utterance. In your first example, my whining teenagers probably wouldn't put any stress at all on but, because they'd load it all on parents. Similar to how the whining child puts massively exaggerated stress on wanna and/or go. – FumbleFingers Apr 17 '11 at 23:06

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