Consonant letters are concepts opposite to vowel letters. All non-vowel letters are generally consonants. Simply put, all non-vowel letters are consonants except semi-vowel letters.

In American English, Spanish, German and French, the consonants are generally 2 1 or 20 or even 22, which are B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X and Z respectively.

In American English, there are differences between C and G in soft and hard sounds /s/ and /k/,/and /g/. Except for a few words, they are hard before A, O and U, and soft before E, I and Y. In German, G is always difficult. In Italian, Spanish and French, C and G also have differences between soft and hard sounds.

Vowel letters:

In English, monosyllabic texts can only use one of vowels A, E, I, O and U to write articles.

The most popular monosyllabic poem was written by C.C. Bombaugh in 1890, and only O was used as the vowel. Here is an example: there is no cool monsoon to soften the Oxford teacher, orthodox, jogging, bookworm Solomon. (The monsoon, which is not cool at all, gently blows the conservative and bumpy bookworm "Solomon", the tutor of Oxford University. )

Bombaugh's famous saying "the gleanings in the field of literature harvest" is the most accurate and comprehensive summary of this strange literature.

The above contents refer to Baidu Encyclopedia-Consonant Letters; Baidu encyclopedia-vowels