Monovowel vowel:

Answer, answer, answer, answer, answer, answer, answer.

Compound vowel:

ai，ei，ui，ao，ou，iu，ie，üe，er .

Pronasal vowels:

Ann, grace, cause, grace, Ewan.

Postnasal vowel:

Eng, Eng, Eng.

The formation of vowels:

Vowel = vowel (middle tone)+vowel (vowel, the most critical part of vowel)+vowel (vowel can be consonant, and consonant refers to nasal vowel).

For example, in the syllable Guan, [g] is the initial and [uan] is the final. In vowel [[〔uan〕], [a] is the belly, [u] is the beginning and [n] is the end.

Rhyme: Also called middle tone, it is the leading part in front of the rhyme belly, with vague pronunciation and often passing quickly.

Rhyme belly: also known as the main vowel, is the key to the pronunciation of a vowel, and it is the most tense and loudest part of the oral muscles in the process of vowel pronunciation.

Rhyme: Vowels can be consonants. One is called nasal rhyme, which has -n and -ng. The other is called rhyme ending. The rhyme ending is the ending part behind the rhyme belly, and the pronunciation is vague, but the pronunciation should be in place.