1, en opens its mouth and eng closes its nose.

2, en is nasal, and the pronunciation part is in the front of the mouth. When pronouncing, the tip of the tongue is in contact with the upper gum, the tongue should be extended forward and the tip of the tongue should be lifted up. Eng is a retronasal sound, pronounced at the back of the mouth. When pronouncing, the root of the tongue is in contact with the soft palate, and it should be adducted and lifted.

3. Both en and eng are vowels, where en is the vowel of the front nose and eng is the vowel of the back nose.