The document discusses different modals of obligation in English including must, have to, should, and ought to. It explains that must and have to express obligation or strong recommendation, with must expressing the speaker's own feelings and have to stating facts. Must can only be used for present and future tense while have to can be used in all tenses. Should and ought to are used to give advice or opinion. You mustn't indicates prohibition. You don't have to means there is no obligation. Examples are provided to illustrate the usage of each modal.
Introduction to obligation modals: 'must' and 'have to' for necessity. Difference in use for personal feelings vs. facts. Examples of obligations (keep fit, put rubbish in bin, speak English, pay taxes): uses of 'must' and 'have to' for rules and requirements.
Uses of 'mustn't' to express prohibitions, examples like not smoking, not using phones, and not sleeping in class.
'Don’t have to' expresses lack of necessity, with examples such as staying in bed and not working on holiday.
Using 'should' and 'ought to' for advice, with examples of recommended actions like taking warm clothes and not drinking too much coffee.
OBLIGATION or STRONG
RECOMMENDATION
Weuse must (do) and have to (do) to say that it is
necessary to do something.
e.g. Well, it’s 11 o’clock. I must/have to go now, I have a
meeting at 11,30.
3.
There is sometimesa DIFFERENCE between must and
have to.
- With MUST the speakers are giving their own feelings,
saying what they think is necessary:
e.g. I must send an e-mail to Liz. I haven’t written to her
since Christmas.
e.g. I must study English if I want to pass the exam.
- With HAVE TO the speakers are not giving their feelings.
They are just giving facts :
e.g. I can’t come on Saturday, I have to work.
e.g. Students have to wear uniforms at this school.
4.
BUT, NOTE:
You canonly use must to talk about the present and
future:
e.g. We must go now.
e.g. You must be on time tomorrow
Have to, however, can be used in all forms :
e.g. I had to leave the party early because I felt ill.
e.g. What do I have to do to get a degree in Economics?
You mustn’t
sleep inclass!
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24.
ABSENCE OF OBLIGATION
Youdon’t have to do something means it is not necessary
to do it.
e.g. I can stay in bed tomorrow because I don’t have to go
to school.
25.
Get up earlyat the weekend
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26.
You don’t haveto
get up early at
the weekend!
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You don’t haveto
work on holiday!
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29.
ADVICE or OPINION
Weuse should (do) and ought to (do) to give advice or say
what you think is a good or a bad thing to do.
e.g. You shouldn’t smoke so much.
e.g. Cyclists should wear a helmet.
* Should and ought to are very similar, and can often replace
each other. But should is much more frequent than ought to.
30.
Take warm clothesif you go to Dublin
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31.
You should takewarm clothes if you go to
Dublin in winter!
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32.
Drink so muchcoffee
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33.
You shouldn’t drinkso much coffee!
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