(Ne pas) devoir : MUSTN'T ou DON'T HAVE TO
Interdiction ou absence d'obligation ? Une différence cruciale !
Le piège expliqué
🚫 MUSTN'T
Interdiction (il ne faut pas)
You mustn't smoke here. (Tu ne dois pas fumer ici - c'est interdit)
You mustn't tell anyone. (Tu ne dois le dire à personne - secret)
= It's forbidden / It's not allowed
🆓 DON'T HAVE TO
Absence d'obligation (ce n'est pas nécessaire)
You don't have to come. (Tu n'es pas obligé de venir - c'est optionnel)
You don't have to wear a tie. (Tu n'es pas obligé de porter une cravate)
= It's not necessary / It's optional
❌ Erreur fréquente
❌ You mustn't come if you don't want
✅ You don't have to come if you don't want (Tu n'es pas obligé de venir)
🔄 Comparaison
You mustn't smoke = C'est interdit de fumer
You don't have to smoke = Tu n'es pas obligé de fumer (étrange !)
📋 Structures
MUSTN'T + base verb = interdiction
DON'T HAVE TO + base verb = absence d'obligation
Exercice — 10 questions
You · smoke here.
You · come if you don't want to.
Students · use their phones during the exam.
You · wear a tie today.
You · tell anyone about this.
We · hurry. We have plenty of time.
You · drive without a license.
You · cook tonight. I'll order pizza.
You · park here. It's forbidden.
You · finish this today if you're busy.