/ʤ/ | Raise the middle part of your tongue towards the hard palate, which is the bony ridge in the roof of your mouth, just behind your front teeth. At the same time, lower the back of your tongue towards the floor of your mouth. | Keep your lips relaxed and slightly open. | Keep your jaw slightly open and relaxed. | Keep your teeth slightly apart. | Build up some pressure behind your tongue by briefly stopping the airflow with the tip of your tongue against the hard palate. Then, release the air by quickly pulling your tongue back from the hard palate. | Start vibrating your vocal cords just as you release the burst of air. This produces a voiced sound. |
/ʃ/ | The tongue raises a bit in the middle. It does not touch the roof of the mouth. It presses against the inside corner of the top teeth. The front part of the tongue comes down not touching anything in the mouth. | The corners of the lips are in. The rest of the lips flare. | | The teeth are together. | Air passes through the mouth. | The vocal cords do not vibrate. |