This document discusses intonation in English phonetics. It defines intonation as the pitch patterns of spoken English which involve modifying voice pitch to stress words. Intonation cues listeners to an utterance's type, such as a statement or question, and can indicate mood. It is different from but related to stress. The document covers pitch, tone, the structure of tone units including the nucleus and tail, and the functions of intonation including attitudinal, accentual, grammatical and discourse functions. It also discusses falling and rising intonation tunes and their uses.