Level A2
MUST
Le modal de l'obligation forte et de la déduction logique.
Formation
Affirmative ✓
Subject + MUST + verb
You must go.
She must be right.
Negative ✗
Subject + MUSTN'T + verb
You mustn't lie.
= Interdiction!
Question ?
MUST + subject + verb?
Must I go?
(peu commun)
When to Use MUST
⚠️
Strong Obligation
Obligation forte, règle
"You must wear a seatbelt."
🧠
Logical Deduction
Déduction logique (quasi certitude)
"She must be tired. (= I'm sure)"
⭐
Strong Recommendation
Recommandation forte
"You must try this restaurant!"
🚫
Prohibition (MUST NOT)
Interdiction formelle
"You must not smoke here."
🔥 MUST vs HAVE TO
MUST
Obligation personnelle / interne
"I must study harder."
(= Je pense que je dois...)
HAVE TO
Obligation externe / règle
"I have to wear a uniform."
(= C'est la règle)
💡 Tip: Au passé, on utilise HAD TO (MUST n'a pas de forme passée!)
"I had to work yesterday." ✅
⚠️ MUSTN'T vs DON'T HAVE TO
MUSTN'T
= Interdiction! Tu ne DOIS PAS
"You mustn't smoke here."
🚫 C'est interdit!
DON'T HAVE TO
= Pas obligé. Tu n'es pas obligé de...
"You don't have to come."
✅ Tu peux si tu veux, mais pas obligé
