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Answer:

A modal verb is a verb that is used in combination with a normal verb. While auxiliary verbs help make questions and negatives and put a verb in a particular tense, modal verbs add a special meaning. For example, the phrase “They go to school” can change meaning with a modal verb in the following ways:

They must go to school. = They have an obligation to go.

They can go to school. = They have the possibility to go.

They might go to school. = It’s possible they will go to school.

Modal verbs can express obligation, advice, permission, offers, the future, and possibility.

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