The order of notating tones:

1. Find aoe first, then iuü: mark the tones in the order of a, o, e, i, u, ü.

2. Don’t miss it when you see the vowel a: If there is an a in the vowel, mark it with a. For example, lao is marked with a.

3. If there is no a, look for o, e: If there is no a, but there is o or e, mark it on o or e. For example, lou is marked on o and lei is marked on e.

4. i and u are listed next when they are parallel: when i and u are parallel, they are marked at the back. For example, liu is marked on u, gui is marked on i.

Tone refers to the change in the pitch of a language. In modern Chinese phonetics, tone refers to the pitch of the sound inherent in Chinese syllables that can distinguish meaning. The scales in music are also determined by pitch, which can be simulated by using scales. You can also learn tones with the help of your own sense of music. But it should be noted that the pitch of the tone is relative, not absolute; the change of tone is sliding, not like a leaping movement from one scale to another. The level of the tone is usually marked using the fifth-degree marking method: a vertical mark is set up, divided into 5 degrees in the middle, with the lowest being 1 and the highest being 5. Mandarin has four tones: Yinping, Yangping, rising tone and falling tone.