Diphthongs: Gliding Vowels
A diphthong is a vowel sound that glides from one sound to another within the same syllable. Think of it as two vowel sounds combined.
What Makes a Diphthong?
Unlike simple vowels (where your mouth stays in one position), diphthongs require your mouth to move during the sound.
Key concept: A diphthong starts at one vowel position and glides to another. The whole movement happens in one syllable.
The Main English Diphthongs
/eɪ/ as in “day”
Starts at /e/ and glides toward /ɪ/.
Examples:
- day, say, way, play
- name, game, same, came
- rain, train, main, pain
- great, break, steak
/aɪ/ as in “my”
Starts at /a/ and glides toward /ɪ/.
Examples:
- my, by, fly, try, sky
- time, fine, line, mine
- high, night, right, light
- buy, guy
/ɔɪ/ as in “boy”
Starts at /ɔ/ and glides toward /ɪ/.
Examples:
- boy, toy, joy, enjoy
- coin, join, point
- noise, voice, choice
- oil, boil, soil
/aʊ/ as in “now”
Starts at /a/ and glides toward /ʊ/.
Examples:
- now, how, cow, wow
- out, about, shout, loud
- house, mouse, south
- down, town, brown
/əʊ/ (British) or /oʊ/ (American) as in “go”
Starts at /ə/ or /o/ and glides toward /ʊ/.
Examples:
- go, no, so, show
- home, phone, bone, alone
- road, boat, coat, goal
- know, grow, slow, snow
/ɪə/ as in “here” (mainly British)
Starts at /ɪ/ and glides toward /ə/.
Examples:
- here, near, dear, fear
- ear, year, clear
- idea, real
/eə/ as in “there” (mainly British)
Starts at /e/ and glides toward /ə/.
Examples:
- there, where, air, fair
- care, share, rare
- wear, bear, pear
/ʊə/ as in “pure” (mainly British)
Starts at /ʊ/ and glides toward /ə/.
Examples:
- pure, sure, cure
- tour, poor
Note: In American English, /ɪə/, /eə/, and /ʊə/ are often pronounced as single vowels + /r/, not as diphthongs.
Common Mistakes
Mistake 1: Making diphthongs too short
Wrong: Saying “go” as just /o/ instead of /əʊ/ Right: Let the sound glide from start to finish
Mistake 2: Making the second part too strong
The second part of a diphthong should be lighter than the first. Wrong: “day” as DAY-EE Right: “day” with a gentle glide
Mistake 3: Confusing similar diphthongs
- /eɪ/ “day” vs. /aɪ/ “die”
- /aʊ/ “how” vs. /əʊ/ “go”
Practice: Same Spelling, Different Sound
English spelling can be confusing. These all have different diphthongs:
| Word | Diphthong |
|---|---|
| ow in “now” | /aʊ/ |
| ow in “know” | /əʊ/ |
| ou in “out” | /aʊ/ |
| ou in “soul” | /əʊ/ |
Minimal Pairs
Practice hearing the difference:
| /eɪ/ | /aɪ/ |
|---|---|
| day | die |
| say | sigh |
| bay | buy |
| /aʊ/ | /əʊ/ |
|---|---|
| cow | co (company) |
| how | hoe |
| now | know |