In this lesson, we’ll start applying Thai tone rules step by step, beginning with the simplest and most important case:

👉 words without tone marks that are live syllables.

Quick Review: Live Syllables

Live syllables allow the sound to continue smoothly.
A live syllable is a syllable that:

• ends with a long vowel, or
• ends with a soft final consonant
  (น, ม, ง, ย, ว)

This lesson builds directly on what you already know — consonant classes, vowel length, and soft endings. By focusing only on live syllables, we reduce complexity and help you clearly see how tones are formed before moving on to more advanced cases.

Take your time with this lesson. Once you understand tone rules for live syllables, everything else will feel much easier.

Quick Summary & Key Takeaways

When a syllable doesn't have a tone mark, you need to look into two factors:

1. Class of consonants
2. Live or dead syllable
3. Short or long vowel (only for low-class consonants)

Live syllables end with:

• a long vowel, or
• a soft final consonant (น ม ง ย ว)

Tone Rules

• Middle-class consonant → Mid tone
• Low-class consonant → Mid tone
• High-class consonant → Rising tone

Let's Practice!

This is your first real tone rule — and it’s an important one. Don’t rush to memorize everything at once. I created a Wordwall Online Exercise for you to practice defining tones. Go ahead and practice before moving on to the next set of tone rules.