Diphthongs

Learn what diphthongs are and how vowel sounds glide from one sound to another in words like coin and cloud.

Key Takeaways

This page covers one specific vowel topic in a clear way and links to the next lessons readers usually need.

  • Focus on one vowel rule or pattern at a time.
  • Use examples and related guides together.
  • Follow the internal links to keep the learning sequence logical.

What is a diphthong?

A diphthong is a vowel sound that glides from one mouth position to another inside the same syllable. In phonics, children often meet diphthongs after they already know short vowels, long vowels, magic e, and common vowel teams.

Common diphthong patterns

OI / OYcoin, boil, toy, joy
OU / OWcloud, sound, cow, owl

Tips for teaching diphthongs

Model the sound slowly and have children listen for the glide. Compare words like boat and boy so learners can hear the difference between a stable vowel team and a moving diphthong sound.

  • Use sorting games with picture cards.
  • Teach spelling patterns in pairs: OI/OY and OU/OW.
  • Review with reading and dictation.

Next steps

Diphthongs fit well after vowel teams and alongside r-controlled vowels in a fuller phonics scope and sequence.