Understanding Auxiliary Verbs

A verb that indicates time by changing tense

A verb used to show possibility, necessity, willingness, or capability (correct)

A verb that can only be used in past tense sentences

A verb that changes form to indicate singular or plural

By changing the form of the modal verb

By using the modal verb with the word have and the past participle form of the main verb (correct)

By adding -ing to the main verb

By changing the main verb to its past tense form

By inserting not after the modal verb before the main verb (correct)

By omitting the modal verb

By adding -n't to the modal verb

By using a different set of modal verbs

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