a concrete preverb can be found in /ka:mwa:ci/ "quietly", in kī-kāmwāci-pimātisiwak , or /ne:wo/ "four" in ē-kī-nēwo-tipiskāyik "when the fourth night passed". Bakker (2006) classes tense as a position 1 preverb but the following mood as both a position 1 and position 2 preverb. Aspect 1 and the Aktionsart are also classified as position 2 preverbs. The difference between Aspect 2 and 3 seems to be that of length, with 2 being durative and 3 being iterative. Reduplication Two types of reduplication occur to verbs and particle roots to denote continuity, repetition or intensity. The first type changes the stem during the process and is not predictable, common, or productive. For example, the root pim- "along" becomes papām- "about". The productive type of reduplication places the reduplicated syllable in front of the root. The reduplicated syllable is formed from the first consonant of the word and an . The final form looks like "over and over". In words beginning with a vowel, the reduplication is marked by , as evidenced by the word "he tells it over and over". Syntax Word order The basic transitive sentence is of the form SVO, such as awāsisak nipahēwak sīsīpa "the children killed some ducks", but the other forms (SOV, VSO, VOS, OVS, and OSV) are also possible. Subject and object noun phrases both may be omitted. Thus "the children killed some ducks" may also be expressed nipahēwak sīsīpa "they killed some ducks", awāsisak nipahēwak "the children killed them" or nipahēwak "they killed them". It is uncommon in conversation for the subject and object of a verb to be realized by full noun phrases. Most often, the highly marked parallel noun phrases are used to indicate emphasis. In narration, sentences with full parallel noun phrases often mark the beginning or end of discourse, indicate peripeteia in narrative, or introduce new information. Sentences of the OSV form with two full nouns occur extremely infrequently. Direction and obviation Direction, or the semantic designation of the actor-goal relationship, is morphologically expressed through theme signs that also show agreement between the verb and its nominal complements. In Plains Cree, direction is dependent on person hierarchy, or the order of person-marking morphemes in the verb. The person hierarchy in Plains Cree is: . Note that 3' refers to the obviative third person. Derivational suffixes mark whether the semantic roles of persons follow this person hierarchy or invert it, called