Modals of Obligation: Must, Have to, Should

Modals of obligation are words that express necessity or responsibility. These are the main modals of obligation in English: 1. "Must" is often used for personal obligations or rules/laws imposed by the speaker. It emphasizes external necessity. Example: You must follow the rules. 2. "Must not" or "mustn't" is used for prohibition (something you are not allowed to do). Example: You must not smoke in the hospital, it is illegal. 3. "Have to" expresses a strong obligation too, but it is used when someone else makes you do something. Example: I have to finish my homework by tomorrow. 4. "Don't have to" indicates that something is not required; it's optional. Example: You don't have to come if you don't want to. 5. "Should" is used when you give advice or suggest something is a good idea. Example: You should see a doctor if you feel sick.