Modals for obligation, recommendation and advice

Use 'must': (>1 answers)

• for a necessary action.

• for a rule.

• to make a strong recommendation.

• to emphasize an intention.

• to describe a duty.

Use 'have / has to': (>1 answers)

• for a necessary action.

• for a rule.

• to make a strong recommendation.

• to emphasize an intention.

• to describe a duty.

You can use 'must' and have/has to':

• for a necessary action.

• for a rule.

• to make a strong recommendation.

• to emphasize an intention.

• for most contexts.

Which one is used for question forms?

• must

• have/has to

Which one is more informal?

• have/has to

• have/has got to

must not describes:

• what is not allowed

• what is not necessary

'do not have to' describes:

• what is not allowed

• what is not necessary

Which is a past form of 'must'?

• had to

• did not have to

• has to

• must

Use should / ought to:

• to make a recommendation

• to make a strong recommendation

• to say what we think is the right thing to do

• to say something is correct

• for a rule

Which sentence is more polite?

• You should study tonight, or else you'll end up in La Salle.

• You must study tonight, or else you'll end up in La Salle.