history of vowel changes in the languages makes drawing up a complete table of correspondences impossible, so only the most common reflexes can be given: in a stressed open syllable in a stressed closed syllable before a geminate in a stressed closed syllable before a consonant cluster when the proto-Semitic stressed vowel remained stressed pS *a,*ā > Akk. e,ē in the neighborhood of pS *ʕ,*ħ and before r. i.e. pS *g,*k,*ḳ,*χ > Ge'ez gʷ, kʷ,ḳʷ,χʷ / _u Grammar The Semitic languages share a number of grammatical features, although variation — both between separate languages, and within the languages themselves — has naturally occurred over time. Word order The reconstructed default word order in Proto-Semitic is verb–subject–object (VSO), possessed–possessor (NG), and noun–adjective (NA). This was still the case in Classical Arabic and Biblical Hebrew, e.g. Classical Arabic رأى محمد فريدا ra'ā muħammadun farīdan. (literally "saw Muhammad Farid", Muhammad saw Farid). In the modern Arabic vernaculars, however, as well as sometimes in Modern Standard Arabic (the modern literary language based on Classical Arabic) and Modern Hebrew, the classical VSO order has given way to SVO. Modern Ethiopian Semitic languages follow a different word order: SOV, possessor–possessed, and adjective–noun; however, the oldest attested Ethiopian Semitic language, Ge'ez, was VSO, possessed–possessor, and noun–adjective. Akkadian was also predominantly SOV. Cases in nouns and adjectives The proto-Semitic three-case system (nominative, accusative and genitive) with differing vowel endings (-u, -a -i), fully preserved in Qur'anic Arabic (see ʾIʿrab), Akkadian and Ugaritic, has disappeared everywhere in the many colloquial forms of Semitic languages. Modern Standard Arabic maintains such case distinctions, although they are typically lost in free speech due to colloquial influence. An accusative ending -n is preserved in Ethiopian Semitic. In the northwest, the scarcely attested Samalian reflects a case distinction in the plural between nominative -ū and oblique -ī (compare the same distinction in Classical Arabic). Additionally, Semitic nouns and adjectives had a category of state, the indefinite state being expressed by nunation. Number in nouns Semitic languages originally had three grammatical numbers: singular, dual, and plural. Classical Arabic still has a mandatory dual (i.e. it must be used in all circumstances when referring to two entities), marked on nouns, verbs, adjectives and pronouns. Many contemporary dialects of Arabic still have a dual, as in the name for the nation of Bahrain (baħr "sea" + -ayn "two"), although it is marked only on nouns. It also