.Lithuanian demonstrative pronouns create a structure that differs from the state known from the Polish language. Lithuanian pronouns sis, si 'his here'; sitas, sita 'his here' normally find their correspondents in Polish ten, ta 'this here'. Lithuanian pronouns anas, ana 'this there' most often are projected onto Polish tamten, ów, owa 'this there'. Defining Polish equivalents for Lithuanian tas, ta 'this', however, is more problematic. By default, Polish ten, ta 'this', which are formally identical with ten, ta 'this here', are used. But it is not always the case that Lithuanian tas, ta is fully represented by Polish ten, ta. Especially, when Lithuanian tas, ta is used as a part of a composite expression, e.g. tas vakaras, then an incompletely articulated lingual/quantificational expression is possible in Polish, e.g. wieczór. Some ways of Lithuanian tas use, identical with the use of neutral pronouns, like tai, tatai, sitai, sitatai, as well as to the use of masculine pronouns sitas, sis, correspond to the use of Polish to (neutr. sg) 'this', which differs from to 'this here'. Unambiguity of Lithuanian tas, ta 'this' usage in relation to the polysemantic Polish ten: 'this here' and 'this' is conducive to the evolution leading to the development of the regular article.
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