Modals of obligation

Modals of obligation

Level 5

There are different modal verbs.

Do you remember any?

Today we'll check modals of obligation:

• must / have to

• don't have to

• mustn't

• should / shouldn't *

Must / have - has to

• We use these modals to express a strong obligation

• They are based on rules and what's "correct"

• 'have to' can be conjugated in any tense (past, present, future)

• 'must' only exists in the present, or with a future idea.

Open Ended

Complete the following sentence:

I’ll _______ get up early tomorrow. My interview is at 9:00.

Open Ended

Complete the following sentence:

You _______ be on time tomorrow because there's a test.

don't / doesn't have to

• We use this verb to expres that it's not necessary to do something.

• Basically, if you do it, it's because you decided to do it, even though nobody asked you to do it.

• On Sundays, you don't have to pay for the entrance at the museums.

  
  

Open Ended

Complete the following sentence:

Well, if she doesn't want to go to the party, she _________ to go. There's no need to go somewhere you don't like.

Mustn't ( must not)

• The meaning of this modal verb is an absolute prohibition.

• According to the rules, you are not allowed to do something.

• Do not confuse it with 'don't have to'

• Other alternatives are:

• can't / not be allowed to

Open Ended

Complete the following sentence:

You _______ swim in this river. It's a protected are and the fines are really high.

Should / shouldn't

• These modals express a recommendation.

• In the end, you have the final decision.

• You shouldn't eat junk food all the time.

• We should practice speaking English at home.

Open Ended

Complete the following sentence:

You ________ take warm clothes with you to Quito. It might be cold at night.

Any question?

Then, let's take a quiz!

Multiple Choice

You _______ use your phone in quiet zones.

• don't have to

• mustn't

• have to

Multiple Choice

Do you think we _________ text Dad to tell him we’ll be late?

• have to

• shouldn't

• can't

Multiple Choice

A pilot __________ wear a uniform when he’s at work.

• has to

• can

• should

Multiple Choice

We ________ hurry. We have plenty of time.

• don't have

• mustn't

• shouldn't

Multiple Choice

You _______ send text messages when you are driving.

• don't have to

• mustn't

• shouldn't

Have you got any questions?