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Can, Have To, Must

The document discusses the use of modal verbs to express permission, responsibilities, obligations, and prohibitions in English. It explains that "have to" and "must" are used to express obligation, "don't have to" expresses lack of requirement, and "mustn't" denotes prohibition. Specific rules for using each modal verb are provided, such as "must" expressing obligations from the speaker or important actions, and "have to" referring to obligations from external rules or others. Examples are given to illustrate the appropriate contexts for each modal verb. [END SUMMARY]

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Luis Inagan
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99 views5 pages

Can, Have To, Must

The document discusses the use of modal verbs to express permission, responsibilities, obligations, and prohibitions in English. It explains that "have to" and "must" are used to express obligation, "don't have to" expresses lack of requirement, and "mustn't" denotes prohibition. Specific rules for using each modal verb are provided, such as "must" expressing obligations from the speaker or important actions, and "have to" referring to obligations from external rules or others. Examples are given to illustrate the appropriate contexts for each modal verb. [END SUMMARY]

Uploaded by

Luis Inagan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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OBLIGATIONS AND PROHIBITIONS

When we want o express permisison, responsabilities,


obligation or prohibition we use modal verbs .

HAVE TO AND MUST are used to express obligation.

DON’T HAVE TO is used to express that something is not


required and MUSTN’T is used to express prohibition
MUST

 MUST and MUSTN’T are the same for all persons

 We use MUST when we think it is important to do an action or we give people


orders.

 You MUST be home by eleven

 She MUST tidy up her room every day

MUST
 We use MUST when the obligation comes from the speaker.

 I must go to the doctor, I don’t feel well.

 I must have my homework ready tonight.

 I must stop smoking.


HAVE TO

 We use HAVE TO when the obligation comes from someone else, not the speaker; for
an action that is necessary because of rules.

 We HAVE TO be at the airport three hours before the flight leaves.

 At work I HAVE TO wear a uniform.

 My father HAS TO pay the rent every month.

MUSTN’T

 MUSTN’T is used to say that something is against the rules or against the law,

 You MUSTN’T smoke at school.

 You MUSTN’T use your telephone on a plane

DON’T HAVE TO

 DON’T HAVE TO is used to show that there is no obligation.

 In this restaurant you DON’T HAVE TO wear a tie.


 My brother DOESN’T HAVE TO wear uniform at
his school.
 We DON’T HAVE TO get up early on wekeneds.
EXERCISES

 Choose the correct modal ver to fill inthe spaces in blank. Must- have to, don’t have to y
Mustn’t

 1. You don´nt have to _______come to the meeting, but it will be nice if you are there.
 (mustn’t- don’t have to)

 2. You must start saving money if you want to retire in few years.
 (must- have to)

 3. We have to to visit the doctor every year because the Social Security requires it.
 (must- have to)

 4. I must call my dad every day.


 (must- have to)

 5. My brother mustn´t wear a tie in his work, I do.


 (mustn’t – doesn’t have to)

 6. You must eat healthier and stop smoking, you will feel better.
 (must- have to)

 7. I have to study tonight, my exam is tomorrow.


 (must- have to)

8. People drink and drive cars. It is prohibited


to) mustn´t
(mustn’t - don’t have)
 9. John can’t come because he have to work tomorrow.
 (must- has to)

 10.We mustn´t speak when the teacher is speaking.


 (mustn’t- don’t have to)

 11. I can hear you. You mustn´t shout.


 (must’t - don’t have to)

 12.She has a big problem. We must help her.


 (must- have to)

 13. You don´t have to sing a document withou reading it first.


 (mustn’t – don’t have to)

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