A boy walks near buildings.
A girl is walking in the forest
Girl and boy are not the same gender
exists e1 x1 x2.(near(e1,x2) & n_building(x2) & Actor(e1,x1) & v_walk(e1) & n_boy(x1))
exists e1 x1 x2.(n_forest(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1))