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The inferential mood has five pure tenses. Two of them are simple – past aorist inferential and past imperfect inferential – and are formed by the past participles of perfective and imperfective verbs, respectively. There are also three compound tenses – past future inferential, past future perfect inferential and past perfect inferential. All these tenses' forms are gender-specific in the singular. There are also conditional and compound-imperative crossovers. The existence of inferential forms has been attributed to Turkic influences by most Bulgarian linguists.[citation needed][1] Morphologically, they are derived from the perfect.