tu

In a sentence

• Tu es très gentil.

  You are very kind.

  In this sentence, 'tu' is used as the subject pronoun addressing a single person informally. It is the second person singular form in French.

• Où vas-tu?

  Where are you going?

  Here, 'tu' is inverted with the verb 'vas' to form a question structure, maintaining its role as the subject pronoun for informal and singular address.

• Tu as mangé du pain ce matin.

  You ate some bread this morning.

  This example demonstrates 'tu' in a declarative sentence, continuing its function of denoting the informal second person singular address.