Phonological rules are part of communication through language, whether spoken or written, and knowing what they are and why they exist can help us better understand our world. ... Phonological rules describe how phonemes are realized as their allophones in a given environment.

Why are phonological rules important?

Phonological rules create alternations in the phonetic realizations of related words. These rules must be learned by infants in order to identify the phonological inventory, the morphological structure, and the lexicon of a language.

What is the function of phonological rule?

The function of phonological rules in a grammar is to provide the phonetic information necessary for the pronunciation of utterances.