A boy jumps into the water at a beach.
Nobody is jumping
Either nobody is jumping or a boy jumps.
exists e1 x1 x2 x3.(n_water(x2) & at(e1,x3) & n_beach(x3) & into(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_boy(x1))
-exists e1 x1.(Actor(e1,x1) & v_jump(e1) & n_person(x1))