Language, in all its complexity, is both a system and a living act. It is structured by rules that govern its forms, yet it flourishes through human intention and interaction. This book, Language in Function: From Verb Roots and Mood to Speech and Text Acts, seeks to trace the continuum between the formal structures of language and their dynamic realization in communication. It is an exploration of how linguistic meaning evolves, from the simplest morphological unit, the verb root, to the full pragmatics of speech and textual interaction.