Phonology is a branch of linguistics that studies the system of sounds and their functions.

The phenomenon of rendaku plays an important role in Japanese phonology.

Phonetics is the study of the phonemes of language.

He worked hard to accomplish his goals.

His role is the team leader.

Health is very important.

His opinion is very important.

He is studying Japanese.

This phenomenon remains unexplained for scientists.

He received the letter challenging him to a duel and began preparing for the duel.