Question

how to determine if we should add les or des in french

Answer 1

Les is the plural definite article; Des is the plural indefinite article. These articles are used with countable nouns (things you can count, like dogs, cakes).

So basically les is used in place of the and des is used in place of from.

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Answer 2

Answer:

Les is the plural definite article (the)

Des is the plural indefinite article. (some)

Explanation:

Le vélo rouge est derrière les vélos bleus.

-The red bicycle is behind the blue bicycles.

if you want to pluralize le, la, or l’, then you will use les.

Il y a un chien. – Non, il y a des chiens.

There is a dog. – No there are [some] dogs.

if you want to pluralize un or une, then you will use des.