Russian is a fusional (inflected) language, with words being modified to express tense, case, voice, aspect, person, number, gender, and mood. There are three tenses (past, present, and future), with each verb having two aspects (perfective and imperfective). There are six cases, including nominative, accusative, dative, genitive, instrumental, and prepositional. It utilizes a subject-verb-object (SVO) word order, but with significant flexibility.