1. These are split into two varieties : agentive and patientive ambitransitives. 2. Lexical causatives are apparently constrained to involving only one agentive argument. 3. Zero-derived agentive nouns may show plurality by means of subject markers. 4. The agentive is used for ergative and instrumental functions. 5. Cross-linguistically, the agentive argument tends to be marked, and the patientive argument tends to be unmarked. 6. That is, for any given intransitive verb the speaker may choose whether to mark the argument as agentive or patientive. 7. Plurality in these forms is normally marked only by the use of the duo-plural agentive suffix in place of singular. 8. In these scenarios, the verb takes on additional morphology to show for a non-agentive reading on the initial argument. 9. The agent of the action is indicated with the agentive ( " actance " ) prefix and a suffix expressing person and number. 10. For example, " shaman " may be either, with an overt agentive suffix, but the zero-marked is more common.