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This is a type of modal which indicates that something should not be done or that someone must not do something.

This type of modal is used to express responsibility or commitment. Examples of this modal are must and have to

This is a type of modal which is used to express consent or approval. Examples of this modal are can and could.

This verb form is use to express a degree of certainty about an outcome or the possibility of something.

Modals is a/an _______ verb.