Obligation & Necessity Quiz

Modals of Obligation (Must, Have to, Need to)

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1. Strong Obligation/Necessity

• MUST: Expresses a strong, often **internal or personal, obligation** (the speaker thinks it's necessary).
  • Example: **I must remember** to call the doctor tomorrow. (Internal feeling/decision)
  • Example: This is a great film! **You must watch** it! (Strong recommendation/personal conviction)
• HAVE TO / NEED TO: Expresses an **external obligation** (rule, law, duty, or required necessity).
  • Example: We **have to submit** the report by Friday. (External deadline/rule)
  • Example: All passengers **need to show** their passport. (External rule/requirement)

2. Absence of Obligation (Not Necessary)

• DON'T HAVE TO / DON'T NEED TO: Means something is **not necessary** or not required. (You can do it, but you don't need to.)
  • Example: You **don't have to come** to the party if you're busy. (No obligation)
  • Example: We **don't need to buy** milk; we still have some. (No necessity)

3. Prohibition (Forbidden)

• MUSTN'T: Expresses a **strong prohibition** or rule against doing something. (It is forbidden.)
  • Example: You **mustn't use** your phone while driving. (Strong rule/law)
  • Example: We **mustn't forget** to back up our work. (Strong negative necessity/warning)

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