Mastering the TH Sounds: Voiced and Voiceless

The Challenge of TH

The TH sounds /θ/ and /ð/ don't exist in most languages, making them notoriously difficult for English learners. But with proper technique and practice, you can master these distinctive English sounds.

Two TH Sounds in English

Voiceless TH: /θ/

As in: think, bath, teeth

Key feature: No vocal cord vibration

Voiced TH: /ð/

As in: this, breathe, clothe

Key feature: Vocal cords vibrate

How to Produce TH Sounds

Tongue Position

1. Place tongue tip between upper and lower front teeth
2. Tongue should touch the bottom edge of upper teeth lightly
3. Air flows through the gap between tongue and teeth
4. Tongue should be visible between your teeth

Testing the Difference

For /θ/ (voiceless):

• Touch your throat - no vibration
• It's just breath/air flowing through
• Like a strong whispered 's'

For /ð/ (voiced):

• Touch your throat - feel vibration
• Vocal cords are active
• Has a buzzing quality

Common Substitutions to Avoid

1. T or D Instead of TH

❌ "I tink" instead of "I think"
❌ "Dis" instead of "this"

Why it happens: Many languages don't have TH, so speakers use the closest sound

2. S or Z Instead of TH

❌ "sank you" instead of "thank you"
❌ "breaze" instead of "breathe"

Why it happens: TH is similar to S/Z but requires different tongue position

3. F or V Instead of TH

❌ "free" instead of "three"
❌ "vis" instead of "this"

Why it happens: Some languages use F/V sounds where English uses TH

Words with /θ/ (Voiceless TH)

Initial Position

• think, thank, three, thick, thumb

Final Position

• bath, math, teeth, north, month

Medial Position

• something, author, method, pathway

Words with /ð/ (Voiced TH)

Initial Position

• this, that, they, there, then

Final Position

• breathe, clothe, soothe, smooth

Medial Position

• father, mother, brother, together, weather

The TH Rule: When to Use Which

Use /ð/ (Voiced) for:

• Function words: the, this, that, these, those, they, them, their
• Between vowels: father, mother, brother
• Verb endings: breathe, clothe, soothe

Use /θ/ (Voiceless) for:

• Content words: think, thank, thing
• Word endings: bath, math, teeth, month
• After consonants: strength, width

Practice Exercises

Exercise 1: Minimal Pairs

Practice distinguishing TH from similar sounds:

• think vs sink (/θ/ vs /s/)
• three vs tree (/θ/ vs /t/)
• this vs dis (/ð/ vs /d/)
• then vs den (/ð/ vs /d/)

Exercise 2: Voiced vs Voiceless

Practice the difference between /θ/ and /ð/:

• breath /θ/ (noun) vs breathe /ð/ (verb)
• teeth /θ/ vs teethe /ð/
• cloth /θ/ vs clothe /ð/

Exercise 3: Tongue Twisters

Build muscle memory with these:

• "The thirty-three thieves thought that they thrilled the throne throughout Thursday."
• "This, that, these, those - they're the three brothers."
• "I think that math and paths are worth the breath."

Troubleshooting Common Problems

Problem: Tongue Too Far Back

Solution: Look in a mirror. You should see your tongue tip between your teeth.

Problem: Too Much Pressure

Solution: Light contact. Don't bite your tongue!

Problem: Can't Feel the Difference

Solution: Put your hand on your throat. Voiced TH vibrates, voiceless doesn't.

Practice Schedule

Week 1: Master voiceless /θ/ in isolation and words
Week 2: Master voiced /ð/ in isolation and words
Week 3: Practice distinguishing the two
Week 4: Use both naturally in sentences

Conclusion

The TH sounds are challenging but completely learnable. With correct tongue position, awareness of voicing, and consistent practice, these distinctive English sounds will become natural. Remember: tongue between teeth, light contact, and practice daily.