"I am" Sounding Like "I Yam"? English Sneaks a Glide In Between Two Vowels

You may have noticed it at natural speed: "I am" comes out sounding a little like "I yam," and "go on" a little like "go won." The instinct is to assume you misheard, or mispronounced something.

Neither. This is a habit English uses constantly and almost never mentions in a textbook: two vowels are not allowed to sit right next to each other without something bridging the gap.

Why vowels don't like touching

A consonant next to a vowel is easy — car is becomes /kɑːr ɪz/, one closed shape flowing into one open shape. Two vowels back to back is the awkward case: both are "open" gestures colliding, and the mouth either stops briefly in between (a small catch in the throat, which sounds clipped and effortful) or slides through with a barely-there consonant. Native speakers do the second thing, using a sound that never appears in the spelling at all — a glide. There are only two: /j/ and /w/.

Which glide shows up depends on how the first word's mouth shape ends

• If the first word ends in a spread, front vowel or diphthong — /iː/ /ɪ/ /eɪ/ /aɪ/ /ɔɪ/ — the mouth is already close to the /j/ position (the shape for "y" in yes), so a /j/ slips in:

- I am → /aɪ jæm/

- she asked → /ʃiː jɑːskt/

- the end → the is already /ðiː/ before a vowel, so → /ðiː jend/

- my answer → /maɪ jˈɑːnsə/

• If the first word ends in a rounded, back vowel or diphthong — /uː/ /əʊ/ /aʊ/ — the mouth is already close to the /w/ position (the shape for "w" in we), so a /w/ slips in:

- go on → /gəʊ wɒn/

- do it → /duː wɪt/

- how are you → /haʊ wɑː juː/

- too easy → /tuː wiːzi/

The rule reduces to one sentence: a spread ending pulls in /j/, a rounded ending pulls in /w/. You don't need to memorize which phrases take which glide — you only need to know how the first vowel ends, and the rest follows.

It isn't a new sound — it's two sounds you already know, doing extra work

/j/ and /w/ aren't unfamiliar. They're just the y in yes and the w in we, showing up here with no letter to represent them, purely as connective tissue between two vowels. When this makes speech sound "run together," nothing was actually swallowed — the speaker just closed the gap that would otherwise sit between two open sounds.

Part of the same family as other linking phenomena

If you've come across consonant-to-vowel linking (turn it off) or intrusive R in British speech (law and order), glide linking is the same underlying instinct applied differently: whenever two sounds sit close together with a gap between them, English tends to fill that gap the cheapest way possible. This time the trigger isn't a consonant, and it isn't accent-specific — both American and British speech do it.

How to practise it: identify the shape, then supply the glide

Pick a few phrases where a vowel-ending word meets a vowel-starting word. Decide whether the first word ends on a spread or rounded shape, then add /j/ or /w/ accordingly. Early on, it helps to stretch the glide out a bit so you can feel where it sits in the mouth; it will shrink down to almost nothing once it's automatic. That tiny bridge is exactly what makes a sentence sound connected instead of chopped into separate words.

Not sure where a sentence needs a glide, or which word carries the stress? PHONO reads any English text through your camera and marks every word with IPA and linking cues, with both US and UK audio.

Download: https://apps.apple.com/us/app/phono-english-phonetics-ipa/id6783243417 · phono.douhouse.com