This paper reports the results of a complete study of F0 patterns along with durational information for their proper application, in the case of single word utterances of the Greek language expressing both affirmative statements and questions. A third type of single word expression by which the listener is prompted that more information follows is also considered. This is useful for a systematic study of the influence of the context. For each type of expression a representative pattern is obtained and modelled by using Chebyshev approximation techniques. The quality of the resulting pencil of functions is evaluated in the environment of a text to speech synthesis (TTS) system which is based on the syllable concatenation approach.