5.2.3.3 Unaccusatives and ergatives
All of this demonstrates that ergative verbs can be analysed in exactly the same way as unaccusatives, in their ‘intransitive’ use, and as being part of a causative construction in their ‘transitive’ use. Indeed, ergative verbs themselves are identical to unaccusatives, even in causative constructions as it is the causative light verb which supplies the extra agent argument and the causative interpretation. For this reason, many linguists refer to these kinds of verbs as unaccusatives. However, it still remains that there are differences between the unaccusative verbs we reviewed above and the ergative verbs reviewed in this section. For a start, ergatives cannot appear in the there constructions and unaccusatives cannot appear in causative constructions: