How to Make the Sound
Place the tip of your tongue between your upper and lower teeth. Don't put it between your lips. Make the sound by forcing air through the opening between your teeth and your tongue. Vibrate your vocal cords to make/ð/. The difference between /ð/ and /θ/ is that the first is voiced and second, voiceless.
mother
feather
mouth
Practice #1: Word Repetition
Listen to the following words and repeat.
Although
Seethe
Father
Northern
Mother
Soothe
Loathe
Teethe
Them
Than
Practice #2: Minimal Pairs
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