| 41. | Classical Irish had a three-way aspectual contrast of simple perfective imperfective in the past and present tenses.
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| 42. | In Bulgarian, which has produced a new regular formation, the aorist is used in perfective imperfective aspect.
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| 43. | The perfective and imperfective need not occur together in the same utterance; indeed they more often do not.
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| 44. | This mutation occurs in imperfective aspect ( present tense ), and in irrealis mood ( future tense ):
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| 45. | The unidirectional verb serves as the base for the perfective, and the multidirectional as the base for the imperfective.
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| 46. | The indicative mood has five " simple " ( imperfective, conveying an action that occurs repetitively or continuously ).
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| 47. | There is a tendency to prefer imperfective verbs in imperative sentences for politeness; negative imperatives quite rarely use perfectives.
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| 48. | This mutation occurs in imperfective aspect, and in the presence of the additive marker " mom ":
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| 49. | The difference is mainly stylistic : imperfective is neutral here, while using perfective causes stronger tone of the statement.
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| 50. | Moreover, all past and remote forms have developed imperfective forms marked by " [ mi-] ".
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