Rules
Tone Rules
Factors

Consonants
Low Class
Middle Class
High Class

Tone Marks
- Low Class
- Middle Class
- High Class

Exams
- Consonant Groups
- Which Tone? (Low)
- Which Tone? (Mid)
- Which Tone? (High)

The following are the High Class consonants.
ข ฉ ถ ฐ ผ ศ ษ ส ห

Of these the consonant ห should be specially noted. When the letter ห as an initial consonant is followed by one of the Low Class consonants;

ง, ญ, น, ม, ย, ร, ล and ว

...it is usually silent but this makes no difference to the tone rule. As the initial consonant ห is a high class one the tone of the syllable follows the high class tone rules.

Tone Rules for High Class Consonants.

1. Syllables beginning with a high class consonant and have no tone mark take the Rising Tone unless they end with K, P or T sounds or a short open vowel.

2. Syllables beginning with a high class consonant and having no tone mark take the Low Tone if they end in K, P or T sound or with a short open vowel.

3. Syllables beginning with a high class consonant and having the tone mark MYAYK (-่) over the consonant take the Low Tone irrespective of ending.

4. Syllables beginning with a high class consonant and having the tone mark MYTO (-้) over the consonant take the Falling Tone irrespective of ending.

Click here for examples.
If you think you are ready, click here for the exam.