Speaking Mandarin well, the training methods of nasal sounds before and after.

1, pronunciation practice. Before N, after ng, when ng is pronounced, press the root of the tongue against the soft palate, let the air flow out of the nasal cavity, and at the same time, the vocal cords vibrate and produce nasal sounds. When practicing, the root of the tongue should not leave the soft palate, which can prolong the sound. Practice the chorus after carefully figuring out the direction of tongue movement.

2. Contrast exercises to distinguish. In practice, find some nasal sounds before and after the practice, such as "Wen", "Weng", "Xin" and "Xing".

3. Memory can also be classified, such as "Tintin", and the corresponding "Ding, stare, nail, hall and top" are all nasal. By analogy, the related radicals can follow this method.

Extended data:

The pronunciation differences before and after nasal vowels are as follows:

(1) The tongue position is different. When nasal -N is pronounced, the tip of the tongue is pressed against the upper gum to avoid loosening or retraction; When the nasal sound is -ng, the root of the tongue is raised high, and the root of the tongue is retracted against the soft palate as far as possible.

(2) the mouth shape is different. When the hair is -n, the upper and lower incisors are opposite and the mouth shape is closed; When the hair is -ng, the upper and lower incisors are far apart and the mouth shape is wide.

(3) The timbre is different. The anterior nasal sound -n is sharp and clear, and the posterior nasal sound -ng is rich and loud.

Reference: Baidu Encyclopedia-Postnasal

Reference: Baidu Encyclopedia-Nasal Pronunciation