Pronunciation and Spelling / Vowels and Diphthongs
Diphthongs are a combination of 2 vowel sounds
For example in 'kite' the vowel 'i' is pronounced [ai] that is [a] combined with [i],
(but in 'head' the 2 vowels 'e' and 'a' are pronounced [e], that is 1 vowel sound...)