An analysis of English intonation focuses on fall-rise and rise-fall instruction. Fall-rise intonation marks material from which the speaker would derive a precondition for what he is saying, while rise-fall intonation marks material from which the speaker would derive a consequence from what he is saying based on inversion of the clause where the rise-fall appears. Data are drawn from a covertly recorded telephone conversation between two males about a series of mishaps suffered by a woman driving a car. In addition to the main finding that both certain implicatures and certain explicatures can be derived from fall-rise tones, it was also found that back-channel utterances by the listener were significantly related to the speaker's intention as interpreted by the listener through intonation, and that a sexist stance on the speaker's part was conveyed through intonation. A transcription of the pertinent conversation, with explicatures noted, is appended. (Contains 10 references.) (MSE)