Objectif de cette leçon : maîtriser ce point de grammaire — Should vs Must vs Have to.
Should vs Must vs Have to
Master the differences between advice and obligation
📖 Explanation
🇬🇧 English
Should = advice, Must = obligation (internal),Have to = obligation (external).
🇫🇷 Français
"Should" exprime le conseil ou la recommandation — You should rest. "Must" marque une obligation que l’on s’impose à soi-même — I must finish this tonight. "Have to" renvoie à une obligation extérieure, imposée par les circonstances ou par un règlement — I have to wear a uniform at work.
Piège fréquent : à la forme négative, les deux n’ont pas du tout le même sens. "Mustn’t" exprime une interdiction (il ne faut pas), tandis que "don’t have to" exprime une absence d’obligation (ce n’est pas nécessaire).
✅ Usage Rules
Should
Usage: Advice, recommendations
Examples:
• You should study more.
• We should leave now.
Must
Usage: Strong internal obligation
Examples:
• I must finish this today.
• You must be careful.
Have to
Usage: External obligation
Examples:
• I have to work late.
• She has to wear uniform.
❌ Common Mistakes
❌ Wrong: You must to go
✅ Correct: You must go
❌ Wrong: I should to do my homework
✅ Correct: I should do my homework