Diphthongs are two vowel sounds that combine to create a new sound. Unlike a vowel digraph, where two vowels are side-by-side but each retains its own sound, in a diphthong, the two vowels create a unique, blended sound.

Some examples of diphthongs include oi, oy, ou, ow, and au. Learning about diphthongs is important for developing reading and spelling skills.

Examples of Diphthongs:

  1. Oi and oy: The oi and oy diphthongs are found in words like boil, toy, and boy.
  2. Ou and ow: The ou and ow diphthongs are found in words like house, mouse, cow, and how.
  3. Au: The au diphthong is found in words like auto, haunt, and sauce.

How to Teach Diphthongs:

  1. Introduce the diphthong: Explain to students that a diphthong is two vowels that make a single sound. Start with one diphthong at a time and use examples of words that use that diphthong.
  2. Practice pronouncing the diphthong: Have students practice pronouncing the diphthong and the sound it makes. Use pictures or objects to reinforce the sound and help students make connections.
  3. Read words with the diphthong: Read words that use the diphthong and have students identify the sound. Practice blending the sounds together to read the words.
  4. Write words with the diphthong: Have students practice writing words that contain the diphthong.
  5. Play games: Play games like “I Spy” or “Word Bingo” using words that contain the diphthong.


  1. Identify the diphthong in the following words:
  • Boil
  • House
  • Auto
  • Boy
  1. Write a word that contains each of the following diphthongs:
  • Oi
  • Au
  • Ow
  • Ou
  1. Use the following words in a sentence:
  • Mouse
  • Sauce
  • Haunt

Diphthongs are an important aspect of reading and spelling. By teaching students to recognize and pronounce diphthongs, they will be better equipped to read and write words with these diphthongs.

Introduce the diphthong, practice pronouncing the diphthong, read words with the diphthong, write words with the diphthong, and play games to reinforce the learning of diphthongs.

Consonant Digraphs

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