Which of the following words contains a diphthong? Remember that spelling is irrelevant. A word may contain a diphthong although it contains only one vowel grapheme, i.e. one letter which represents a vowel. And a word may not contain a diphthong although it contains two successive vowel graphemes.
- main
- mine
- so
- great
- book
- reference
- referee
- tough
- cow
- boy
- loud
- caught
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