You've over-simplified things. In fact your advice is wrong.
obaj - both malesPark
is a masculine noun, but you CANNOT say *obaj parkiObaj
is used by all masculine personal nouns (rzeczowniki męskoosobowe
in Polish), used only for describing people.
ex: obaj nauczyciele, obaj panowie, obaj Polacy, obaj koledzy
obie - both females
This is correct. Obie
is used for all female nouns (rzeczowniki żeńskie
ex: obie nauczycielki, obie panie, obie Polki, obie koleżanki, obie książki
oboje - both male and female
This is over-simplified. You use oboje
when there is a group of two people, one male, one female. It's also politically correct to say for example: oboje studentów
instead of obaj studenci
, because you're not specifying that the two students are masculine.
is used with nouns such as drzwi
(sled) that have no singular form and always appear in the plural, even though the meaning is singular. In grammar these are known by the Latin term pluralia tantum.
One last usage for oboje
is for young beings (mostly animals)
ex: oboje kurcząt
(chicks), oboje kociąt
(kittens), oboje dzieci
Note that in all instances of oboje
+ a noun the noun is in the Genitive case (dopełniacz
), whereas obaj/obie/oba
+ noun the noun is in the Nominative (mianownik
oba - both things (neutral nouns)
This is half right. Oba
is used only for neuter (neutral is incorrect) nouns not described above. ex: oba drzewa
(trees), oba imiona
It's also used for masculine non-personal nouns. ex: oba koty
(cats), oba widelce
(forks), oba budynki