This declension (case) indicates a change in state of a noun, with the general sense of "becoming X" or "change to X". In the Finnish language, this's the counterpart of the Essive case, with the basic meaning of a change of state. It's also used for expressing "in (a language)" and "considering it's a (status)". Its ending's -ksi. Examples: pitkä "long", venyi pitkäksi "(it) stretched long" englanti "English", englanniksi "in English" pentu "cub", Se on pennuksi iso "For a cub, it'… (More on Translative)