Question

Fill in the blank with the appropriate modal which demonstrates an obligation:

He _____ pay you the money he owes you.

• A. used to
• B. would
• C. ought to
• D. have to

Answer 1

The correct option is C ought to

Modals are used to show that we believe something is certain, probable or possible.

An obligation is an act or course of action to which a person is morally or legally bound.

Option C - Correct as it shows an obligation.

The incorrect options are:

Used to - denotes that something happened continuously or frequently during a period in the past

Would - it denotes a future possibility and not an obligation.

Have - it is used in case of plural objects. Money is a singular uncountable noun.