"The night is very long."
Translation:La nokto estas tre longa.
Nouns aren't gendered in Esperanto. Each ending or suffix makes it change to a different grammar parts.
All nouns end in 'o'. Knabo, knabino, nokto.
Adjectives end in 'a'. Blua, bela, varma.
Another example is the word rose. Rozo is the flower, while roza is the color pink.
All nouns can be Adjectives and all adjectives can be nouns as long as you switch the suffix.