In French, the plural indefinite article is usually des (some), used before plural nouns like des mystères (mysteries).
However, when an adjective comes before a plural noun, des changes to de.
| Astrology explains great mysteries. | L'astrologie explique de grands mystères. |
| My horoscope announces beautiful things. | Mon horoscope annonce de belles choses. |
Notice that if you remove the adjectives (grands, belles), the sentences revert to using des (des mystères, des choses).
While most French adjectives follow the noun, a specific group—often relating to beauty, age, goodness, and size—comes before it. When using these preceding adjectives in the plural, always use de.
| With this telescope, we see new constellations. | Avec ce télescope, on voit de nouvelles constellations. |
| The horoscope announces bad news. | L'horoscope annonce de mauvaises nouvelles. |
| This book tells old legends. | Ce livre raconte de vieilles légendes. |
| The sky shows great omens tonight. | Le ciel montre de grands présages ce soir. |
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