This document discusses intonation and tone units in English phonology. It begins by defining intonation and noting that pitch plays an important role. It then discusses the components of a tone unit, including the pre-head, head, tonic syllable, and tail. Examples are provided to illustrate these components. The document also discusses the five main tones in English - level, falling, rising, fall-rising, and rise-fall - and provides examples of their functions. It notes that intonation patterns can indicate meanings and attitudes beyond the literal meaning of words.