Short I and Short O
The letters i and o have short sounds too — /i/ as in pig and /o/ as in dog — each a different middle hum. · 9 min
In the last folio, the letter a taught you its short sound — /a/, the hum in the middle of cat. The other vowels have short sounds too. Today, two of them. Say pig. Now say dog. Each word has a little hum right in the middle — and the two hums are not the same.
Guess before you learn
Say the word pig slowly, stretching the middle: p — i — g. That little hum in the very middle — which sound is it?
It is /i/. Pig, pin, six — they all share that small, smiley middle hum. If you picked /o/ or /a/, you still picked a real short vowel — just not this one. Those are dog's hum and cat's hum, and telling the three apart is exactly what this folio is for. Keep your pencil mark beside the ink.
K–2
3–5
Every vowel letter has a short sound, and now you know three: /a/ in cat, /i/ in pig, /o/ in dog. Each one lives in the middle of a little word. To find it, say the word slowly and listen for the hum between the first sound and the last — that hum is the vowel. If it helps, cover the first and last letters with two fingers: the letter left in the middle is the one doing the humming.
Be careful — /i/ and /o/ do not sound alike, and mixing them up makes a different word. Dig and dog. Pit and pot. The letters sit there small and quiet, but that middle hum decides which word you are reading.
6–8
A vowel letter is a busy letter: it spells more than one sound. The letter i can say its short sound /i/ (pig) or its long name (pie); o can say short /o/ (dog) or its long name (go). Which one you use depends on the shape of the word. When a vowel is wedged between two consonants in a short word — a closed syllable, like pig or dog — it almost always takes its short sound. That one rule opens the door to hundreds of the first words you will ever read.
9–12
Linguists write these sounds with exact symbols so there is no confusion: short i is /ɪ/, and short o is /ɒ/ in British English or /ɑ/ in most American speech. The symbols mark where the tongue sits. For /ɪ/ the tongue rides high and toward the front of the mouth, lips relaxed — a small, tight sound. For /ɒ/ the tongue drops low and pulls back while the lips round — a big, open sound. That is why pig feels tight and dog feels open: your tongue is in a different place for each. Swap the vowel and you swap the tongue position — and the word.
K–2
You already know /a/ — the hum in cat. Here are two more. Say pig. That middle hum is /i/. Now say dog. That middle hum is /o/. Two new sounds, right in the middle.
Say /i/ with a small, smiley mouth: pin, six, lip. Say /o/ with a round, open mouth: pot, box, mop. Feel your mouth change.
Undergrad
English writes five vowel letters but speaks roughly a dozen vowel phonemes, so every letter is overloaded. Short i and short o are lax (or 'checked') vowels: they appear in closed syllables and cannot end a stressed English word on their own. Pairs like pit / pot and hit / hot are minimal pairs — words differing in exactly one phoneme — and they are the proof that /ɪ/ and /ɒ/ are two separate, meaning-bearing sounds, not casual variants of one. Teaching short vowels is really teaching a child to hear phonemic contrasts the language already uses but the spelling only partly marks.
Postgrad
The short vowels are a fossil record. Before the Great Vowel Shift of roughly 1400–1700, English long vowels held 'continental' values close to their spellings; the shift raised and diphthongized the long vowels but left the short vowels — /ɪ/, /ɒ/, /æ/ and their kin — largely in place. That is why short i and short o still sound roughly as the letters suggest, while the long vowels drifted far from theirs (compare the i of pig with the i of pine). English orthography froze mid-shift, so one letter now maps to both an older short value and a newer shifted long one. The 'short vowel in a closed syllable' rule a five-year-old learns is, underneath, a rule for reading the layer of the language the shift never moved.
short vowel
The quick, un-stretched sound a vowel letter makes inside a little word — /a/ in cat, /i/ in pig, /o/ in dog. It sits in the middle and does not say the letter's name.
Here is why that middle hum matters so much. It is not just decoration — it decides the word. Keep the first sound and the last sound exactly the same, change only the hum in the middle, and you land on a brand-new word.
Why is this true?
Why does changing the middle sound turn dig into dog, when the first sound and the last sound stay exactly the same?
Because the vowel in the middle is a sound too, not just a resting spot. A word is all of its sounds, in order — change any one of them, even the quiet middle hum, and you have named a different word.