What is the difference between zh, ch, sh and r?
Roll up your tongue tip to touch the upper rear part in mouth.
For zh, little airflow is coming out from your mouth.
For ch, more airflow is coming out from your mouth than pronouncing zh.
For sh, your tongue tip should touch the upper part in mouth to let the airflow come out without any obstacles.
For r, on the basis of pronouncing sh, your vocal cords should vibrate.
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