Abstract:：This paper takes several dialogues in Friends as examples, discusses the functions of English intonation, which aims to illustrate the composition, the different characteristics and the different uses of tunes. The author of the thesis holds that idea tunes will not change the meanings of vocabularies in sentences, but the meanings of sentences will change when different tunes are used. This paper also argues that different tunes may give the same sentences different meanings, sometimes even the opposite. And the paper concludes that in oral English tunes play a very important role in conveying meanings.
Key words: English intonation; tune; functions