Il y a ordinateurs dans la bibliothèque.

a) une
b) des
c) un

Une is used when the noun is a féminin.

Example

une gomme — an erasure. gomme is a féminin noun so we use une instead. (most words that have 'e' as the last are most likely a féminin

une table

Des is used when the noun is plural. Similar to English where you add 's' or 'es', it becomes plural. For French, most words that add 's' or 'x' are most likely plural.

Example

des ciseaux

des enfants

Un and Une both have same meaning. It means the article 'a' in English. But things in French have genders so both are separated for gender uses. Un is for masculin.

Example

un homme

un livre

From the sentences, our noun is ordinateurs (computers). The word is a plural because we have 's' at the last of word. Therefore, we cannot use une or un.

salut !

aie de la patience avec ton frère, il est encore petit.

verbe "avoir" impératif présent

aie

ayons

ayez