Mixe languages have SOV constituent order, prepositions and genitives precede the noun. In Old and Middle English, the genitive case was productive, and adverbial genitives were commonplace. The (possessive) genitives of the personal pronouns are replaced by the possessive pronouns. The possessive pronouns are derived from the genitives of the personal pronouns. Alternative for possessive adjectives are possessive genitives which are used much more commonly. Many Ryukyuan languages mark both nominatives and genitives with the same marker. What some authors refer to as "possessives", others may call "genitives", and vice versa. Proto-Finnic had a series of possessive suffixes for nominals, which acted partly as genitives. The possessive genitives of these words are "mano", "tavo" and "savo" respectively. The former category contains subjects and predicates, and the latter contains objects and genitives. There were two periods of "his" genitives. Possession is indicated in other ways, mainly by genitives and existential clauses. The history of the "his" genitives in English is extensively covered in Allen (2008). Genitives precede nouns and relative clauses follow. Genitives (possessives) and relative clauses can also either precede or follow the noun they modify.