This structure transforms grammar from a passive lecture into an active training session. You learn a rule, look at the examples, and immediately apply it. This instant feedback loop is why learners progress faster with this book than with any other.
C'est un étudiant. Il a 20 ans. Il est content. Qui est-ce ? C'est Lucas. Qu'est-ce que c'est ? C'est un livre. Le livre est sur la table. This structure transforms grammar from a passive lecture