English — Expressing Obligation: Must, Have to, Should — 3rd Year Middle School — Algerian Curriculum

Expressing Obligation: Must, Have to, Should

These modal verbs express different levels of obligation and advice.

Must (strong obligation):

• You must wear a seatbelt.
• Students must arrive on time.
• Negative: mustn’t (prohibition): You mustn’t smoke here.

Have to (external obligation):

• I have to do my homework.
• She has to wear a uniform at school.
• Negative: don’t have to (no obligation): You don’t have to come.

Should (advice):

• You should eat healthy food.
• He should study more.
• Negative: shouldn’t: You shouldn’t stay up late.

Exercises:

Exercise 1: Complete with must, have to, or should:
1. You … brush your teeth twice a day. (should)
2. I … finish my project by Friday. (have to)
3. You … cheat in exams. (mustn’t)

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