There are male and female nouns in Spanish.
Male – O
Female – TO
Genus male (men): the Hermano, the Nino, the father, the Janeo, the sol, the car, the Wintero, the Thursday, the bar, the day, the Rojo, the Brazo.
Genus female (women): the woman, the Hermanto, the Ninto, the mother, the Janeto, the Monto, the streets, the CAsto, the IDEas, the musicto, the night, the Rojto, the CAMISto.
Exceptions: the mano, the moto, the radio, the sofa., the mapto.
Same in masculine and feminine words
Green - the Green, Grand - large, blue - the blue.
Words which can be male and female:
The sea - the sea.
They can be male, female, and neutral; singular and plural.
They are accompanied to the NOUNS AND ADJECTIVES
They are: THE,, UN, ONE, ONE, ONE, ONE, (IT is neutral)
Male: THE (singular) / THE (plural)- A (singular) / A few (plural)
Female: THE (singular) / THE (plural)- A (singular) / A few (plural)
Contracts: TO THE = to - OF THE = from the
THE book, THE House, THE yellow, THE yellow, THE high, THE high, THE children, THE cities, THE classes, THE rivers, THE men, THE women, A book, A FEW children, A FEW women, A House, IT well, IT Bad boy IT Green...
When We know the nouns use The, THE, THE and THE (they are certain items):
THE Professor is Spanish (we all know the Professor).
THE children play in the street (I know very well those children).
THE window is open (we know that window is).
I saw you in THE bar (we know what bar is).
When We do not know the nouns use A, ONE, A, A FEW, A FEW (they are indefinite articles).
A Professor of Spanish (do not know the teacher).
A FEW children play in the street (do not know them).
I see A open window (do not know what).
Yesterday I went to A bar (we don't know which bar).