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Obligation
Have to
Must
Should
Strong obligation
Must ≈
 Only Present
 Personal / occasional
obligation
Mustn’t ≠
Prohibition
= can’t / not allowed
Have to (have got to)
 All tenses
 External obligation
(law/rule)
Don’t have to
No obligation
(= not necessary)
Weak obligation
should
 Modal verb
 Advice / opinion
You should tell her how you
feel.
 more common in
questions, especially in
daily conversation
 Negative: should not to
 Past form: should have V-ed(3)
ought to
 Semi-modal verb
 Advice / opinion (a little stronger)
You ought to tell her how you
feel.
 Ought sounds rather
formal when used
interrogatively
 Negative: ought not to
 Past form: ought to have V-ed(3)
=
SHOULD: GIVING ADVICE
MUST/MUSN'T: STRONG OBLIGATION
1. I don't think you ____ eat so much chocolate. It's
bad for your health.
2. Children _____ behave well when they're in class.
3. If you drive a car, you ____ stop at marked
crossings.
4. I think waiters _____ try to be pleasant with
customers.
5. Some workers _____ wear hard hats because their
jobs are considered dangerous.
6. If you feel sick, you _____ stay at home. It's better
for you.
7. Police officers ______ wear a uniform.
MUST: STRONG OBLIGATION. IT'S PERSONAL. IT
INVOLVES THE SPEAKER'S OPINION.
HAVE TO: STRONG OBLIGATION. IT'S EXTERNAL: law,
rules...
8. I _____ do my homework. My teacher always
checks if we have done the exercises.
9. I _____ get my hair cut. I don't like it so long.
10. We ____ go home. My mother has told me to arrive
at ten o'clock.
11. I ____ study hard. I want to pass the exam.
12. In Spain, children ____ go to school until they're
16.
13. You _____ phone every day, darling!
MUSTN'T: STRONG PROHIBITION
DON'T HAVE TO: IT'S NOT NECESSARY
14. You ____ accept things from strangers!
15. When you go into a clothes shop, you _____ have to
buy something. You can just look.
16. You ____ steal things from shops.
17. Children ______ pay bills.
18. Children ______ eat junk food every day.
19. Some millionaires _____ get up very early.

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4B Obligation

  • 2. Strong obligation Must ≈  Only Present  Personal / occasional obligation Mustn’t ≠ Prohibition = can’t / not allowed Have to (have got to)  All tenses  External obligation (law/rule) Don’t have to No obligation (= not necessary)
  • 3. Weak obligation should  Modal verb  Advice / opinion You should tell her how you feel.  more common in questions, especially in daily conversation  Negative: should not to  Past form: should have V-ed(3) ought to  Semi-modal verb  Advice / opinion (a little stronger) You ought to tell her how you feel.  Ought sounds rather formal when used interrogatively  Negative: ought not to  Past form: ought to have V-ed(3) =
  • 4. SHOULD: GIVING ADVICE MUST/MUSN'T: STRONG OBLIGATION 1. I don't think you ____ eat so much chocolate. It's bad for your health. 2. Children _____ behave well when they're in class. 3. If you drive a car, you ____ stop at marked crossings. 4. I think waiters _____ try to be pleasant with customers. 5. Some workers _____ wear hard hats because their jobs are considered dangerous. 6. If you feel sick, you _____ stay at home. It's better for you. 7. Police officers ______ wear a uniform.
  • 5. MUST: STRONG OBLIGATION. IT'S PERSONAL. IT INVOLVES THE SPEAKER'S OPINION. HAVE TO: STRONG OBLIGATION. IT'S EXTERNAL: law, rules... 8. I _____ do my homework. My teacher always checks if we have done the exercises. 9. I _____ get my hair cut. I don't like it so long. 10. We ____ go home. My mother has told me to arrive at ten o'clock. 11. I ____ study hard. I want to pass the exam. 12. In Spain, children ____ go to school until they're 16. 13. You _____ phone every day, darling!
  • 6. MUSTN'T: STRONG PROHIBITION DON'T HAVE TO: IT'S NOT NECESSARY 14. You ____ accept things from strangers! 15. When you go into a clothes shop, you _____ have to buy something. You can just look. 16. You ____ steal things from shops. 17. Children ______ pay bills. 18. Children ______ eat junk food every day. 19. Some millionaires _____ get up very early.