The phrase is usually one group of words that are pronounced together with a spirit and to convey a certain fact or information to the reader or interlocutor. The rhythm consists in the pause the speaker makes while pronouncing a sentence, where comes to expression the process of lowering and raising the voice between the phrases. In this situation comes also to expression the criterion for the number of information as well as the prevalence of the main information identifying the key word of the phrase, as a result of the theoretical question which is information or a firsthand fact that is being conveyed to the interlocutor during the conversation or in the written text, which falls more in the eye in relation to the others. These two criteria are in fact the key and the instrument for the scientific identification of the border between phrases.