3.1. You have to buy the tickets at the box office

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1- What do these verbs express? (obligation, advice, prohibition, lack of obligation)

a) There are many possible activities in the tower to choose from but you do not have to do all of them.

b) Obviously, you do not have to get this package necessarily.

c) You have to buy the tickets at the box office if you have not bought them online.

2- How can we rewrite this sentence with a modal verb?

The building of this tower was necessary in order to solve communications problems.
They ...
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Learn more about modal verbs of obligation by having a look at this video. Also try to complete the sentences suggested. It will be VERY VERY HELPFUL!

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What is the difference between modal verbs and auxiliary verbs?

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Although the verb 'have to' is not formally a modal verb, its use is very similar to 'must' and they are often studied together.

But be careful! The negative form 'don't/doesn't have to' is very different from 'mustn't' in meaning!

MUST = HAVE TO (Obligation)

MUSTN'T (Prohibition)

DON'T/DOESN'T HAVE TO (Lack of obligation)

Summarizing:

OBLIGATION ADVICE
 		PROHIBITION
 		LACK OF OBLIGATION

must

have to

should (not)

ought to 

mustn't
don't/doesn't have to

Icono de iDevice Self-Assessment activity
Complete the sentences with an appropriate modal verb of obligation, advice, prohibition or lack of obligation:

1. You be here before 8.30. It's not necessary to arrive so early.

2. You study harder if you want to get a university degree.

3. You wear a uniform if you go to an English Secondary School.

4. You drink alcohol if you are under 18.

5. You book the hotel in advance in case there are no rooms left.

6. Mark study French. It's optional.

7. Marta do that. It's forbidden.

  

Icono IDevice Further knowledge

Practice 'must', 'have to', 'should' and 'ought to' by clicking here.

Do this exercise on the difference between 'must' and 'have to'.

Here are some good exercises on 'mustn't' and 'don't have to'.

Finally practice must, have to and should on this website.

Let's learn modal verbs of ability and permission in the next section!
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