Intonation refers to the rising and falling patterns of pitch in speech. In English, intonation is used to distinguish between statement and questions, emphasize certain parts of an utterance, and indicate attitude. There are two main types of intonation: falling intonation typically used for statements and commands, and rising intonation typically used for yes/no questions and requests for clarification. Sentence stress is also important in English, as certain words in an utterance are stressed more than others to convey meaning and distinguish statements from commands.