In French, just like in English, to make most nouns plural, you simply add -s at the end.
Learn how to make a noun plural in French
J'ai un enfant et mon frère a trois enfants.I have one child and my brother has three children.
Il y a deux ballons bleus et un ballon rouge.There are two blue balloons and one red balloon.
Je vois un petit chien et deux grands chiens.I see a small dog and two big dogs.
Note that you don't pronounce the plural -s in French.
ATTENTION:
If a noun already ends in -s or -x or -z in the singular form, then it remains unchanged in the plural form.
Je vois une souris ! Je vois deux souris !I see one mouse! I see two mice!
L'écureuil a une noix... non, deux noix !The squirrel has one walnut... no, two walnuts!
Mon nez est petit, mais leurs nez sont gros.My nose is small, but their noses are big.
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