This is problematic for the ergative theory because the "-mV" participle, labelled the "ergative" marker, is a passive marker in most of the languages that use it, and the Finnish agent participle constructions may in fact derive from similar constructions in Baltic languages, e.g. Lithuanian "tėvo perkamas automobilis" or "automobilis (yra) tėvo perkamas". Notable is the unmistakable resemblance between the Baltic and Finnic verbal suffixes, and the fact that "-mV" is missing in both Estonian and Mordvinic, despite being two very close relatives of Finnish. However, the Baltic participle in "-ma" does not represent the most common Indo-European ending of a passive participle, even though it does have parallels in other Indo-European languages. Even if the ending derives from Proto-Uralic and not the Baltic languages, the transition from a passive to ergative construction is very common and has been observed in Indo-Aryan, Salish, and Polynesian. The transition begins when the unmarked subject of the passive sentence, usually marked in active sentences (if the language is inflectional), is re-analyzed as an unmarked absolutive, and the marked agent as ergative.