What is the relationship between nasal sounds and our Ningxia dialect?

Shizuishan people should all speak Mandarin very well.

Ningxia dialect has four tones. No matter what word's front nasal sound and back nasal sound will be called back nasal sound, so the biggest difference between Ningxia dialect and Putonghua is the front nasal sound and back nasal sound. Because of nasal sounds, many people in Ningxia don't notice their nasal sounds before and after, or even can't tell them apart. I suggest you talk to people who speak Mandarin well, so that you can know which words you pronounce differently from others, and then write them down in your mind. Next time you say it, you will deliberately pronounce it normally, and you will get used to it. That's how I learned it at school. For example, the normal pronunciation of the word "soldier" should be Ren Jun, and our dialect will be called Jiong people. At this time, you should pay attention, keep it in your mind and remind yourself when you tell others. In a few months, you can clearly distinguish the nasal sounds before and after, so that your Mandarin will be semi-standard. If you want to learn pure Mandarin, you still need to speak more and practice more. Otherwise, you can't get used to it yourself, and your tone is not very accurate. You can ask others the tone you don't understand, and no one will laugh at you. It's normal to speak bad Mandarin, and everyone is used to it. Come on, practice, and wish you learn Mandarin well as soon as possible.