 "substratum" from pre-Roman languages, especially Continental Celtic languages; and "superstratum" from later Germanic or Slavic invasions), the phonology, morphology, and lexicon of all Romance languages consist mainly of evolved forms of Vulgar Latin.However, some notable differences occur between today's Romance languages and their Roman ancestor.With only one or two exceptions, Romance languages have lost the declension system of Latin and, as a result, have SVO sentence structure and make extensive use of prepositions.