This document discusses English phonetics and phonology, specifically intonation. It defines intonation as the variation in pitch when speaking. Intonation serves four main functions: attitudinal, accentual, grammatical, and discoursal. The attitudinal function uses intonation to express emotions. The accentual function uses stress to emphasize important syllables. The grammatical function uses intonation to recognize syntax and sentence type. The discoursal function uses intonation to signal new vs. given information and indicate expectations. Examples are provided for each function to illustrate how intonation conveys meaning.