voici

In a sentence

• Voici mon ami Pierre.

  Here is my friend Pierre.

  This usage of 'voici' introduces Pierre, presenting someone to an interlocutor.

• Voici les clés que tu cherchais.

  Here are the keys you were looking for.

  Here, 'voici' is used to direct attention to the keys, making their presence or presentation known.

• Voici comment résoudre ce problème complexe.

  Here is how to solve this complex problem.

  In this context, 'voici' precedes an explanation or demonstration, drawing focus to the forthcoming information.