Modal verbs of obligation, prohibition, and advice

1. Which modal verb is used to describe an obligation, a rule, or something that is necessary?

• May

• Must

• Can

• Should

2. 2. What is the negative form of 'must'?

• Mustn't

• Can't

• Don't have to

• Shouldn't

3. Which modal verb is used to express strong advice?

• Must

• Should

• Have to

• Ought to

4. What is the difference between 'mustn't' and 'don't have to'?

• Mustn't is for advice, don't have to is for obligation

• Mustn't is for prohibition, don't have to is for necessity

• Mustn't is for necessity, don't have to is for prohibition

• Mustn't is for obligation, don't have to is for advice

5. Which modal verb is more formal and less common than 'should'?

• Have to

• Must

• Can

• Ought to

6. When do we use 'have to' instead of 'must'?

• For all verb forms except present

• For all verb forms except past

• For all verb forms except future

• For all verb forms except perfect forms

7. What is the present form of 'must' used for?

• To give an opinion

• To talk about the past

• To express strong advice

• To describe an obligation

8. Which modal verb is used to give advice or an opinion about what is right or wrong?

• Should

• Ought to

• Have to

• Must

9. What can be used instead of 'mustn't' to talk about prohibition?

• Can't

• Don't have to

• Shouldn't

• Be not allowed to

10. Which modal verb is used to describe something that the speaker thinks is necessary to do?

• Should

• Must

• May

• Can