Comment: This is an example where formally, ttwi- 'run' is inflected for what seems like a periphrastic passive alternation, although the verb's meaning acquires some modal meaning. Interestingly, the expression of any grammatical (potentially nominative, -ga marked) subject is not possible here, which raises the question whether this rather an impersonal construction than a true passive as observed with transitive verbs. This is why the alternation value for this verb has been chosen as 'marginally'.