In French, we often mix some words together to make them shorter and easier to say.

This usually happens with the words "à" (which means "to") and "de" (which means "of"). When they connect with "le" and "les," they change a bit.

Here’s how it works:

1. When we use "à":

• "À" + "le" becomes "au"
  For example: "Je vais au parc" means "I am going to the park."

• "À" + "les" becomes "aux"
  For example: "Je parle aux enfants" means "I am speaking to the children."

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2. When we use "de":

• "De" + "le" becomes "du"
  For example: "Je viens du cinéma" means "I come from the cinema."

• "De" + "les" becomes "des"
  For example: "Il parle des livres" means "He speaks about the books."

Knowing these simple changes can help you form sentences more easily in French.