What part of speech is "must" in "They must have left late"?

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Multiple Choice

What part of speech is "must" in "They must have left late"?

In the sentence "They must have left late," the word "must" functions as a modal verb. Modal verbs are a specific category of auxiliary verbs used to indicate necessity, possibility, permission, or ability. In this case, "must" conveys a strong necessity or certainty regarding the action of leaving. It pairs with the base form of another verb—in this instance, "have"—to help create a verb phrase that expresses an obligation or assumption about past actions. The role of "must" is critical in understanding the modality of the statement, as it signifies that the speaker believes there is a compelling reason to think that the action took place under these stated conditions. Moreover, "must" does not act as an adverb, adjective, or pronoun in this context, which further affirms its classification as a verb.

In the sentence "They must have left late," the word "must" functions as a modal verb. Modal verbs are a specific category of auxiliary verbs used to indicate necessity, possibility, permission, or ability. In this case, "must" conveys a strong necessity or certainty regarding the action of leaving. It pairs with the base form of another verb—in this instance, "have"—to help create a verb phrase that expresses an obligation or assumption about past actions.

The role of "must" is critical in understanding the modality of the statement, as it signifies that the speaker believes there is a compelling reason to think that the action took place under these stated conditions. Moreover, "must" does not act as an adverb, adjective, or pronoun in this context, which further affirms its classification as a verb.

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