Such syllables are said to be ACCENTED or STRESSED . In English any or all of four factors – loudness (force), pitch, sound quantity (length), sound quality may render a syllable more prominent than the others. The pitch component of word stress manifests itself in the fact that the stressed syllable is always that on which there is a potential change of pitch in the phrase though the stressed syllable is not necessarily higher than the unstressed one, cf. compound (n) ['kɒnpaʊnd) and compound (v) [kәm'paʊnd]. Vowels of unstressed syllables are definitely not so long and tend to be reduced in the unstressed position. The main difference being connected with the quantity and the quality of the vowel sound between Russian and English:English vowels are shorter in the unstressed position. As to quality all Russian vowels are qualitatively reduced in the unstressed position, eg.комар, помидор.
