The probability of letter combination TH above 90% is that the tongue end is close to the back of the upper teeth (slightly protruding from the upper and lower teeth), forming a gap, and air flows through the gap between the tongue end and the back of the upper teeth, forming a sound. In real words, the vocal cords do not vibrate, and the consonants are/θ/.

Thumb thumb

three three

Bathroom mat

Thirst thirst

Thief thief

Bath bath

Zuibazui

Teeth. Teeth (plural)

In function words and some real words, vocal cords vibrate to produce voiced consonants/? /。 For example:

Brother, brother

Feather feather

Leather leather

Father's father

Mother, mother

This, that, these, those (definite article)

Because Chinese, Japanese, French and Russian don't have this kind of tongue biting sound, it hurts your tongue when you read it, or it is easily confused with /s/ or /z/. The solution is to practice this tongue biting action more. I hope it can help you solve the problem.