Sometimes the choice between de and du, de la, des is simply a question of whether you're describing a noun or indicating a possessor.
French has four different possessive constructions, which can seem daunting until you realize that English does too - you've probably just never thought about them before.
To emphasize to whom something belongs, you can use the possessive à in one of three constructions.
In English, we use 's (apostrophe s) to indicate that one noun possesses another. The French equivalent is the preposition de, with the order of the nouns reversed.
Read my lesson to improve your knowledge of French possessive adjectives, which are used in front of nouns to indicate to whom or what those nouns belong.
French possessive pronouns are used in place of nouns to indicate to whom or to what those nouns belong.