This is the 535th most frequent Latvian word.
tās
The Latvian word "tās" means "those" in English.
In this sentence, 'tās' is a demonstrative pronoun referring to plural feminine subjects.
Tās māsas ir ļoti draudzīgas.
Those sisters are very friendly.
Here, 'tās' is a pronoun replacing a feminine plural noun in a context of ambiguity.
Es redzēju putnus, bet nesapratu, vai tās ir zīlītes vai zvirbuļi.
I saw birds but couldn't tell if they were tits or sparrows.
In this example, 'tās' is a determiner modifying a plural feminine noun to attribute specificity.