A cowboy is holding the reins of his horse as he poses for a picture.
A cowboy sits by the fire
A cowboy is posing for a picture, he is not by the fire.
exists e1 p1 x1 x2 x3.(n_male(x2) & n_male(x2) & n_horse(x3) & of(x3,x2) & n_rein(x2) & exists e2 x4.(for(e2,x4) & n_picture(x4) & Actor(e2,x2) & v_pose(e2)) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & of(x2,x3) & n_cowboy(x1))
exists e1 x1 x2.(n_fire(x2) & by(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_cowboy(x1))