The transitivity system in Arabic includes two classes of verbs: lāzim lit. ‘stationary’, corresponding to the intransitive pattern in English, and mutaʿaddin lit. ‘crossing over [to an object]’, corresponding to the transitive pattern (taʿaddin). Intran-sitive verbs are self-sufficient, not requiring for the completion of their meaning more than the subject or fāʿil lit. ‘the doer’, e.g. ḏahaba zaydun ‘Zayd left’. It is agreed that transitive verbs need for the completion of their meaning a mafʿūl…