The sequences of adjacent vowels in English like in Romanian language evoke a complex problem, that views the quantity and the quality of the phonic elements the hiatus consists of. Pronouncing two vocalic sounds, there can be a pause between them as a result of the reduction of the air current intensity that comes out of the lungs. In this case those two adjacent vowels are separated in two different syllables, producing a vocalic continuity called hiatus. During the process of articulation, one of the vowels loses its syllabic character, being included into a single syllable, with a single muscular tension together with another vowel. One of the features common to Romanian and English spoken languages through which these two differ from the literary language is the unsteady character of the vowels and the vocalic groups.