The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
389. Many verbs ordinarily transitive may be used
absolutely, having their natural object in the ablative with dé (§/273. N. 2): -
- priusquam Pompónius dé
êius adventú cógnósceret (B. C. iii. 101), before Pomponius could learn of his coming. [Cf. êius
advent=u c=ognit=o, his arrival being discovered.]
For Accusative and Genitive after Impersonals, see §354. b. For the Accusative after the
impersonal Gerundive with esse, see §500.3.