De and Des
In French sentences articles like "de" and "des" must be mentioned. "De" is for singular nouns and "des" is for plural ones, but "de" sometimes appears with plural nouns. What's the rule?
You're probably talking about de in a negative sentence. When negative, de is always de, even for plurals, so it's not:
Je n'ai pas des fleurs, but je n'ai pas de fleurs
Also, when using determining expressions, de remains unchanged when used with plurals.
For example J'ai beaucoup de fleurs = "I have a lot of flowers"; Il y a plein d'oranges = "There are plenty of oranges" etc.