In French, the partitive article "des" becomes "de/d'..." when it is placed in front of an adjective that is preceding nouns.
Using de/d' in front of adjectives preceding nouns in French
Look at these sentences:
Note that when the adjective is placed BEFORE a plural noun, the partitive article des (some) becomes de (or d' in front of a vowel or mute h).
This rule doesn't apply when des is the contraction of "de + les" (= of/from/to the) :
Not sure which adjectives tend to go BEFORE the noun?
Then see Position of French Adjectives - Short and common adjectives that go BEFORE nouns and Position of French Adjectives - More adjectives that go BEFORE nouns
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