3. The English indefinite article a or an is rendered by un, masculine, and une, feminine. Declined in the two genders it stands thus:

Masculine.
Nom. un homme, a man.
Gen. d'un homme, of a man (a man's).
Dat. à un homme, to a man.
Acc. un homme, a man.
Abl. d'un homme, from a man.
Feminine.
une femme, a woman.
d'une femme, of a woman (a woman's).
à une femme, to a woman.
une femme, a woman.
d'une femme, from a woman.

§ 12. The Partitive Article.

This article is used when in English we wish to express a part of anything, indicating it by some or any. The following presentation will show that the article expressing this is analogous with the genitive in both numbers:

Masculine.
du pain, some, any bread.
de l'argent, some, any money.
des oeufs, some, any eggs.
Feminine.
de la viande, some, any meat.
de l'encre, some, any ink.
des cerises, some, any cherries.

Observation.--Some, in the sense of a certain one, must be rendered in accordance with this meaning, as: une certaine femme, some woman = a certain woman. In the plural we may say: des femmes, some women.

§ 13. Gender and Number of Adjectives.

The adjective varies its termination to accord with the gender and number of the noun it qualifies, as:

Un bon garçon.
Une bonne fille.