The Proto-Finnic language is the reconstructed ancestor of the Finnic languages, which includes modern Finnish, Estonian, Karelian, and other related languages spoken in Northern Europe. Over time, the Proto-Finnic language underwent various sound shifts or changes that resulted in the development of the modern Finnish language. Some of the notable sound shifts from Proto-Finnic to modern Finnish include:

1. Vowel harmony: Proto-Finnic had a system of vowel harmony, where vowels in a word had to belong to the same group of front or back vowels. This system is preserved in modern Finnish, where words are formed using front vowels (ä, ö, y) or back vowels (a, o, u) but not mixed.
2. Loss of vowel length: Proto-Finnic had vowel length distinctions, but modern Finnish has lost vowel length as a productive feature. However, vowel length is still important in certain morphological and phonological processes in Finnish.
3. Loss of consonant gradation: Proto-Finnic had a system of consonant gradation, where certain consonants showed alternations between weak and strong forms. This system has largely disappeared in modern Finnish, with some remnants in specific morphological forms.
4. Consonant changes: Proto-Finnic underwent various consonant changes, such as the palatalization of velar consonants (k, g, ŋ) to their corresponding palatal counterparts (k, g, ŋg) before front vowels, and the loss of certain consonant clusters.
5. Loss of some Proto-Finnic sounds: Modern Finnish has lost some of the consonant and vowel sounds that were present in Proto-Finnic, resulting in a smaller phonemic inventory in modern Finnish compared to its reconstructed ancestor.
6. Development of new phonemes: Modern Finnish has also developed some new phonemes not present in Proto-Finnic, such as the long vowels ä and ö, which have become distinctive phonemes in Finnish.
7. Orthographic reforms: Modern Finnish has undergone orthographic reforms over the centuries, resulting in changes in the way words are written, and standardization of the Finnish writing system.
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