Unvoiced vs. Voiced Digraphs: Why "Thick" and "That" Sound Different

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The English language has all speech sounds divided into two: voiced and unvoiced sounds. For children to hone their reading and spelling skills, it is imperative to understand the difference between voiced and unvoiced digraphs.

Of all digraphs, /th/ is the most notorious. Therefore, it is often the last sound children should be introduced to.

Understanding the subtle yet critical difference in tongue placement for unvoiced /th/ and voiced “th” can significantly improve your child’s speaking skills and listening comprehension.

1. The Unvoiced /th/ (Air Only)

You use only air when pronouncing the unvoiced /th/. It does not generate vibration in the throat. This sound applies to words that begin or end with /th/. Most of these words tend to be nouns, verbs and adjectives.

How to help children practice this sound:

  • Ask your child to gently place their hand on the front of their throat.
  • Have them say words such as thick, think, tooth, bath and athlete.
  • They should feel no vibration only a smooth stream of air moving past the tongue and teeth.
2. The Voiced /th/ (Vibrating Power)
When pronouncing the voiced /th/, your vocal cords vibrate, creating a buzz in your throat and mouth. This sound is often found in pronouns, prepositions, articles and in the middle of some words.

How to help children practice this sound:

  • Ask your child to place their hand on their throat again.
  • Have them say these words: that, this, the, they, mother and although.
  • Help them notice a clear, strong vibration under their hand.


Why Does This Matter for Fluency?

For Indian children, it is important to realize this distinction:
  • Listening: Local English speakers naturally apply the difference between unvoiced and voiced digraphs to distinguish words quickly. Failing to hear the voice can slow down comprehension for non native speakers.
  • Clarity: Mixing up the two /th/ sounds can change your meaning or make your speech sound unnatural.

Tip: Always focus on the physical sensation of voicing. It is the easiest way to master this most notorious digraph /th/.

Conclusion

In conclusion, /th/ represents not one, but two entirely different phonemes, where one creates vibration in your vocal cords and the other does not.

Looking for empathetic teaching professionals and English experts to enhance reading, writing, and speaking skills of your children? Visit us at https://littlegeniusacademy.co.in/.

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