The document discusses intonation in language and provides the following key points:
1. Intonation refers to the pitch patterns used in speech and is important for proper communication and understanding. The study of intonation has evolved over time.
2. Languages can be categorized as toned languages, where pitch patterns distinguish words/morphemes, or non-toned like English, where pitch adds meaning but does not change the word.
3. A tone unit is the basic unit of intonation analysis, usually composed of more than one syllable, with components like the tonic syllable, head, pre-head and tail.
4. Common tones in English include fall, rise