The family is walking in the woods.
A family is walking.
A family could be walking in the woods.
exists e1 x1 x2.(n_wood(x2) & n_family(x1) & in(e1,x2) & Actor(e1,x1) & v_walk(e1))
exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_family(x1))