English phonetics and phonology (Peter Roach)

3   long vowels, diphthongs

3.1 Long and short vowels

To remind you that these vowels tend to be long, the symbols consist of one vowel symbol.

Plus a length mark made of two dots :. Thus we have: i:, з:, a:, o:, u:, will now look at each of these long vowels individually 

i: (example words: ‘beat’, ‘mean’, ‘peace’)

з: (example words: ‘bird’, ‘fern’, purse’)

a: (example words: ‘card’, ‘half’, ‘pass’)

o: (example words: ‘board’, ‘torn’, ‘horse’)

u: (example words: ‘food’, ‘soon’, ‘loose’)

3.2 Diphthongs

BBC pronunciation has a large number of diphthongs, sounds which consist of a movement or glide from one vowel to another. A vowel which remains constant and does

not glide is called a pure vowel

Iə (example words: ‘beard’, ‘Ian’, ‘fierce’)

eə (example words: ‘aired’, ‘cairn’, ‘scarce’)

υə (example words: ‘moored’, ‘tour’)

eI (example words: ‘paid’, ‘pain’, ‘face’)

aI (example words: ‘tide’, ‘time’, ‘nice’)

oI (example words: ‘void’, ‘loin’, ‘voice’)

əυ (example words: ‘load’, ‘home’, ‘most’)

aυ (example words: ‘loud’, ‘gown’, ‘house’)

3.3 Triphthongs

A triphthong is a glide from one vowel to another and then to a third, all produced rapidly and without interruption.

The triphthongs can be looked on as being composed of the five closing diphthongs described in the last section, with ə added on the end. Thus we get:

eI + ə = eIə                  əυ + ə = əυə

aI + ə = aIə                  aυ + ə = aυə

oI + ə = oIə