French is using different indefinite articles to talk about something indefinite or when a thing/person is unknown.
French
English
Je crois avoir vu un train.
I think I saw a train.
Singular Indefinite Articles
Rule 1: In singular, the French use the article un for a masculine noun and une for a feminine noun.
French
English
Un train
A train
Une pomme
An apple
Plural Indefinite Article
Rule 2: Des is used for nouns in the plural form no matter the gender.
French
English
Des enfants
Kids
Indefinite Article and Negation
Rule 3: In a negative sentence, the indefinite articles un, une, des become ne … pas de.
French
English
Il a un chat, il n’a pas de chat.
He has a cat, he has no cat.
Rule 4: If de is in front of a vowel or silent "h" it becomes d'.
French
English
Il n'y a pas d'oiseaux ici.
There are no birds here.
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