According to this post, the active infinitive was formed as the locative of nouns based on verbal stems. Why was the locative used for the infinitive, rather than, say, the accusative?

The noun genos/genus "birth" had a locative like genesi/genere or similar, "in birth": I wonder what the semantic conexion and development was from there to an infinitive "being born".

The same applies to the dative ending -i turning a similar noun into a passive infinitive, although it seems this reconstruction is somewhat less widely accepted. What does the dative case have to do with (infinite) passivity?


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