Jacob green and Karl Werner, German linguists, respectively pointed out the laws of phonetic changes of Latin letters, which are called Green's Law and Werner's Law.

grimm's law

Also known as Green's Law or Green's Law, it was put forward by jacob green in the revised edition of German Grammar 1822. It is pointed out that Indo-European languages not only have the same vocabulary and morphology, but also have regular phonetic changes, and some phonological changes in the early history of Germanic languages are described: voiced aspirated sounds become non-aspirated sounds; Voiced stops become unvoiced stops; Voiced stops become fricative.

verner's law

Karl Werner supplemented Green's Law and published a paper entitled "Eine ausnahme der ersten Lautverschieebung" at 1876, explaining some exceptions of Green's Law, which was called Werner's Law in history. For example, when the previous vowel is not stressed, /f/,/θ/,/x/ further become /b/, /d/ and /g/.

Changes of B-P-B-P-F (V, W, pH)-M)-M in Chinese and English: Phonetic Changes of English Words (Green's Law and Werner's Law).

G-H-K (G-H-K (C, ch, qu, ct, X)-J)-J Language Changes: Phonemic Changes of English Words (Green's Law and Werner's Law)

Changes of D-T-Th (S)-SH in Chinese and English: Phonological Changes of English Words.

R-S changes in Chinese and English languages: phonetic changes of English words.

Z-S-C changes in Chinese and English: phonetic changes of English words.

S-Th-H changes in English and Chinese: phonetic changes of English words.

L-M-N-R changes in Chinese and English: phonetic changes of English vocabulary.

G-J-Y changes in Chinese and English: phonetic changes of English words.

Changes of U-V-W and Gu-G-W in Chinese and English: Phonetic Changes of English Words.