Lessons Unit 1, lesson 36
ð as in this
One consonant, on its own page. Hear it, watch where it sits in each word's sheet, then say the words yourself.
ðthe th in this
Same position — tongue tip between the teeth — but now switch your voice on so it buzzes: this. If it sounds like d or z, slow down and feel your teeth on the tongue.
Now say it yourself
Read each word from its sheet, out loud, three times. Where there's a play button, listen first and copy what you hear. Slow is fine — clear beats fast.