Correlates of PP-ergativity
Several properties seem to correlate with the availability of PP-ergative subjects. First, since such ergative subjects are not DP-like, they may not be the best candidates to satisfy the requirement that finite clauses have a subject. Instead, a verb or a verb phrase with agreement features on it raises to the inflectional area instead. That accounts for a particularly high incidence of ergative languages among verb-initial languages. Not all verb-initial languages are PP-ergative languages, if only because a PP-ergative may develop into a DP-ergative, and not all verb-initial languages are even ergative. However, the number of verb-initial languages among PP-ergative languages is disproportionately high. The second correlate of PP-ergativity, the absence of expletive subjects, seems to be related to verb-initiality as well. Finally, PP-ergative languages rarely have non-canonical (quirky) subjects. This observation is tentative and needs to be tested further.
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