Forms
There are three partitive articles in French.
Masculine: du
Feminine: de la
Masculine/feminine (before vowel): de l'
The partitive article designates a part of the whole. Note that depending on what you want to say, the same noun may be introduced by a definite, indefinite, or a partitive article. Compare these examples: some are about a whole thing, some about a part of something:
In negative sentences, du, de la, des, de l' change to de: it doesn’t matter if it’s singular or plural.
Notice the use of the partitive articles in the following dialogue: