This is the 278th most frequent Lithuanian word.
tos
The Lithuanian word "tos" is the feminine plural form of "that" or "those."
In this sentence, 'tos' is used as a demonstrative pronoun to refer to specific books being spoken about.
Tos knygos yra labai įdomios.
Those books are very interesting.
Here, 'tos' serves as a demonstrative pronoun in the genitive singular form related to a door.
Pažiūrėk pro tos duris.
Look through that door.
In this example, 'tos' indicates the genitive singular form referring to a specific song.