I wanted to learn more about phonetics and I stumbled across this website:


However, I couldn't get what the difference is between the pronunciation of /i/ in the word happy /ˈhæpi/ and /ɪ/ in sit /sɪt/ and also between /ʊ/ in the word put /pʊt/ and /u/ in the word actual /ˈæktʃuəl/. This strangely only appears in the online Oxford and Cambridge dictionaries, and I couldn't seem to find it in any other.

  • Not everybody pronounces English words the same. There are lots of vowels in English, and variant pronunciations of vowels are common. Some people use the same vowel in happy and sit. And some people use the same vowel in put and actual. Commented Feb 13, 2017 at 2:05
  • In "standard varieties" (General America, Received Pronunciation), /i/ lies somewhere between /i:/ and /ɪ/, and /u/ between /ʊ/ and /u/. Depending on dialects, /i/ can be closer to either /i:/ or /ɪ/, and the same principle applies to /u/. /i/ and /u/ are "special" phonemes (sounds that you can discriminate) as their inclusion in phonetic (more precisely, phonological) notations in dictionaries is mere convention. According to Peter Ladefoged, as /i/ and /u/ only occur under strict conditions and they barely contrast with /i:/, /ɪ/, /ʊ/, /u:/... Commented Feb 13, 2017 at 6:42
  • one can consider /i/ a variant (an allophone) of /i:/ or /ɪ/, /u/ of /u:/ or /ʊ/, and ignore their specific qualities altogether; but doing that just doesn't feel "right" according to him, as people may disagree in that whether /i/ is an allophone of /i:/ or /ɪ/; therefore, they've been conventionally included in dictionaries. tl;dr, basically you don't have to bother with the differences between /i/ and /ɪ/, /u/ and /ʊ/. Commented Feb 13, 2017 at 6:45
  • Also for what it's worth, /i/ occurs unstressed before a vowel ("India"), represents certain morphemes such as -y ("happy", "easy") and even be- ("begone", "belittle"). /u/ only occurs unstressed before a vowel ("actual"). Commented Feb 13, 2017 at 6:58

2 Answers 2


The tense–lax distinction

As shown there, the vowel at the end of happy /ˈhæpi/ is what we call the FLEECE vowel. It is a tense vowel, sometimes called the close front unrounded vowel. The vowel in sit /sɪt/ is the corresponding lax vowel, the one that we call the KIT vowel, or sometimes the near-close near-front unrounded vowel.

The difference between your other pair is again that of tense /u/ for the GOOSE vowel versus lax /ʊ/ for the FOOT vowel.

You need to learn to hear the difference between these tense/lax vowel pairs, because hearing the tense–lax distinction is critical to understanding English. Until you can hear it, English will always sound confusing to you.

Here's the chart for all twelve simple vowels (monophthongs) of American English:

tense-lax vowel chart for American English

Notice how there are contrasting pairs of vowels:

  • tense /e/ versus lax /ɛ/, so FACE versus DRESS
  • tense /i/ versus lax /ɪ/, so FLEECE versus KIT
  • tense /o/ versus lax /ɔ/, so GOAT versus THOUGHT
  • tense /u/ versus lax /ʊ/, so GOOSE versus FOOT

In materials for young children, the tense vowels are often called “long” and the lax ones “short”, but this is not a good way to talk about them because vowel length is not phonemic. Plus if you were talking about length, you would have to mention that all three phonemic diphthongs (/aʊ/, /aɪ/ and /ɔɪ/) take longer to say, too.

All that said, the word happy does not always end with a tense vowel in all speakers. In those with happy tensing, it does, but in others it does not. Happy tensing is the more common variety.

  • 1
    is the chart the same as in British English?
    – Firdaus
    Commented Feb 13, 2017 at 2:29
  • @Firdaus Mostly, yes. The biggest difference is that many dialects in the British Isles have a thirteenth monophthong, the rounded /ɒ/ known as the CLOTH vowel. That sound occurs in American English as [ɒ] but it is not phonemic; it’s just a way of saying /ɔ/. The exact positioning of each phoneme on the trapezoid varies across the British Isles, but it also varies a lot over North America. Their non-rhotic speakers construe almost uncountably many phantom diphthongs. This is a very high-level synopsis.
    – tchrist
    Commented Feb 13, 2017 at 2:59
  • It might be worth noting that "face"/"dress" is not an exact [e]/[ε] comparison, as "face" is pronounced [feɪs] by many NAmE speakers, while "dress" is simply [dɹεs]. Likewise, "goat" is [goʊt],
    – wchargin
    Commented Feb 13, 2017 at 4:56
  • @wchargin Actually those are minor off glides that should be written as superscripts at most. They can be ignored for most purposes, especially by beginners. They are not full diphthongs in any event, nor are they phonemic. Not all speakers even have them.
    – tchrist
    Commented Feb 13, 2017 at 5:08
  • 1
    @Vun-HughVaw Non-existence of phonemic length, not of phonetic length. Minimal pairs always show phonemes in action. Were they merely allophones the pair would not comprise two words with contrasting phonemes, only two variant pronunciations of the same word under alternate phonetics. I don't know if UK speakers have minimal pairs differing in length alone, only that Americans do not. Too often people go confusing phonemic notation in dictionaries with actual phonetics.
    – tchrist
    Commented Feb 14, 2017 at 3:16

There doesn't have to be a difference. It's perfectly fine to use the "sit" vowel in "happy", and the "put" vowel in "actual".

The reason Oxford dictionaries use a different transcription is simply to account for multiple accents. In some accents, "happy" instead has the vowel sound of "fleece", and "actual" has the vowel sound of "goose". This is called "happy-tensing"; it occurs for nearly all North American and Australian speakers, and for a number of British English speakers.

This may be a little confusing, but in fact it's good news for a learner: you don't have to worry about differentiating /iː/ and /ɪ/ in words like "happy", unlike "sheet" and "shit" or "beach" and "bitch". You can use whichever vowel sound is easier for you to pronounce in words like "happy" and "actual" (although as I mentioned earlier, most North American speakers are more accustomed to using and hearing the "fleece" and "goose" vowels in words like this).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.