Intonation refers to the rise and fall of pitch in speech and is used in English to express meaning, emotion, and structure. Intonation is closely linked to grammar and sentence structure in English. Certain sentence types have characteristic intonation patterns, such as rising intonation for yes/no questions and falling intonation for declarative sentences. Within sentences, intonation is used to emphasize important information through stressing certain words or thought groups. Intonation also conveys aspects such as new information, contrast, meaning, mood, and cultural understanding.