If + présent / will + BV (futur)

 If you work hard, you will pass your exam.

 2. Hypothèse incertaine:

  If + prétérit modal / would + BV (conditionnel présent)

 If you worked hard, you would pass your exam.

 3. Hypothèse non réalisée:

  If + pluperfect modal / would + Have + Participe Passé (conditionnel passé)

 If you had worked hard, you would have passed your exam.