* Definitions Vary: Different sources define "diphthong" slightly differently. Some consider only the "true" diphthongs where the sound changes noticeably throughout the vowel, while others include glides where the sound changes minimally.
* Regional Variation: Pronunciation varies across English dialects, making the number of diphthongs subjective.
Commonly Recognized Diphthongs:
* "True" Diphthongs:
* /aɪ/ (like in "bike")
* /aʊ/ (like in "house")
* /ɔɪ/ (like in "boy")
* /eɪ/ (like in "say")
* /oʊ/ (like in "go")
* Glides:
* /ɪə/ (like in "beer")
* /ʊə/ (like in "tour")
Therefore, depending on the definition and dialect, you might find anywhere from 5 to 7 diphthongs listed.