The tone of speech and its impact on interpersonal relationships has been observed in psychological, sociological and linguistic studies. The scientific research conducted in the second half of the twentieth century shows a relationship between the tone of speech and the development of emotional, social and language attitudes in a society. The research in this pilot study aims at determining how the tone of speech influences interpersonal relationships. To reach the objective the pilot study has been conducted among English Philology students from Poland in the age group from 18 to 26. In this pilot study two research tools are used, namely the questionnaire and the incomplete sentence test arranged independently by the author of the study. The results of the data analysis show that the tone of speech has its impact of the development of interpersonal relationships. In conclusion the results of the pilot study confirm the hypotheses that high tones defined as emotional tones may weaken or strengthen interpersonal relationships, whereas neutral tones only weaken those relationships.