You know how to use partitive articles (du, de la, de l', des) in affirmative sentences by now (see Using du, de la, de l', des to express some or any (partitive articles)).
Now look at these negative sentences:
Partitive articles du, de la, de l' and des all become de or d' (in front of a vowel or mute h) in negative sentences using ne...pas, ne...jamais, ne...plus etc (See also N'avoir plus de = To have none left (negation))
ATTENTION:
This rule does NOT apply to sentences using the verb être and other Verbes d'état, with which the partitive article doesn't change.
Also see Un, une become de or d' in negative sentences (indefinite articles)
Note that definite articles (le, la, l', les) don't change in negative sentences:
J'aime le chocolat. -> Je n'aime pas le chocolat.
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Examples and resources
(literally: At the moment, I don't do window-licking, I do screen-licking!)