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The house is so dirty. I really must clean it. What is the use of the Modal auxiliary?

ATo express Obligation

BTo give Advice

CTo give Permission

DTo denote Ability

Answer:

A. To express Obligation

Read Explanation:

Must is used to express obligation , give orders and give advice.

Related Questions:

Fill in the blanks with correct helping verb:

We ____ here.

The contestants ------ performed quite well.
He _____ love her.
They______ pay the fine.
He ______ working as a teacher.