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. 2020 Jan 21;117(5):2347–2353. doi: 10.1073/pnas.1910923117

Fig. 3.

Fig. 3.

Grammars define consistent ordering rules for syntactic structures. Here, Grammars 1 and 2 order the object after the verb, and Grammars 3 and 4 order the object before the verb. Grammars 1 and 3 conform to the Greenberg correlations and are common around the world; Grammars 2 and 4 are rare or impossible.