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In page Grammatical tense:

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Old Irish, an early Celtic language, had past, present and future tenses.[1]: 86  The past tense contrasts the perfective and imperfective aspects.[1]: 86  Classical Irish, which underwent several changes to its verb morphology,[2]: 178  had a three-way aspectual contrast of simple–perfective–imperfective in the past and present tenses.[citation needed]