Using (simplified) RMRS representations, this might amount to: (3) l:a:boil v(e), a:ARG1(k), a:ARG2(x), water(x) (4) l:a:boil v(e), a:ARG2(x), water(x) Such an approach was used for a time in the ERG with unaccusatives.
it turns out to be impossible to carry through consistently for causative alternations.