Universal #1

Legacy number: 3

 Number  3
 Original  Grammatical systems with ergativity tend to have ergative-accusative splits.
 Standardized  IF alignment is ergative for some rule(s), THEN alignment tends to be accusative for other rules, or also for the same rule(s) in other contexts.
 Formula  ergative alignment ⇒ also accusative alignment
 Keywords  alignment, ergative-absolutive, nominative-accusative, split
 Domain  morphology, syntax
 Type  implication
 Status  achronic
 Quality  statistical
 Basis  languages in Silverstein 1976, Dixon 1979
 Source  Silverstein 1976, Dixon 1979

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Discussion
Counterexamples
possibly Hurrian (extinct, Hurro-Urartean, Ancient Near East) (Plank 1988)
Notes
A very common assumption (virtually any work on ergativity could be cited as a source), usually made in categorical form: No language is purely ergative, while it is possible, or supposedly indeed frequent, for languages to be purely accusative.
On the other hand, there are patterns, especially ones reflecting the semantic cohesion between verb and arguments (closer with patients than with agents when both are present), in word formation and syntax, which would universally seem to align ergatively, suggesting that alignment mixture is universal.
Presumably, for purposes of predicting typological variation as this universal attempts to, only such rules and regularities should be taken into account whose alignment is crosslinguistically variable in the first place.
Comment
Frans Plank · 3 Aug 2006
A very common assumption (virtually any work on ergativity could be cited as a source), usually made in categorical form: No language is purely ergative, while it is possible, or supposedly indeed frequent, for languages to be purely accusative.
On the other hand, there are patterns, especially ones reflecting the semantic cohesion between verb and arguments (closer with patients than with agents when both are present), in word formation and syntax, which would universally seem to align ergatively, suggesting that alignment mixture is universal.
Presumably, for purposes of predicting typological variation as this universal attempts to, only such rules and regularities should be taken into account whose alignment is crosslinguistically variable in the first place.