Three people are sitting on the ground outside of a trailer.
Some people are drinking outside of a trailer.
People do not always drink when sitting outside, they may not be drinking.
exists e1 x1 x2 x3 x4.(n_ground(x2) & on(e1,x2) & of(x3,x4) & n_trailer(x4) & outside(x2,x3) & n_thing(x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2.(of(e1,x2) & n_trailer(x2) & r_outside(e1) & Actor(e1,x1) & v_drink(e1) & n_people(x1))