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understand Oni vs One
Both are for plural personal pronouns, in 3rd person.
"One" is used for persons of Female gender, or for all non-personal nouns of ANY Gender
Studentki. One czytaja duzo. (Female) students. They read a lot.
Gwozdzie. One sa w szufladzie - Nails. They are in the drawer.
Czolgi. One glosno sie poruszaja - Tanks. They move loudly.
"Oni" is used for persons of Male gender.
Strazacy. Oni gasza pozary. Firemen. They put out fires.
Rolnicy. Oni ciezko pracuja. Farmers. They work hard.
Siatkarze. Oni sa wysocy. Netball players. They are tall.
In Polish there is only two genders: masculine-personal (męskoosobowy) and non masculine-personal (niemęskoosobowy).
Sailors, soldiers, teachers, managers, horsemen, engineers, national group, etc all fall under masculine-personal.
Everything and everybody else is non masculine-personal:
Women, children, cow, fish, books, trees, ghosts etc.