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Verbs always end in one of -ar, -er or -ir, in the sense that these are the endings which change. There is no exception to this rule.
But (there's always a but) some verbs are called pronomial or reflexive, and are used with a personal pronouns, and the third singular is se. The verb is given with this pronoun tagged on to the end of the infinitive. So the verb sentirse is really sentir + se, an -ir verb.
That's the very short answer.
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