A man sitting on the ground, playing guitar.
The man is standing.
A man is standing or sitting cant do both
exists e2 e1 x1 x2 x3 x4 x5.(n_ground(x3) & a_topic(x1) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_guitar(x5) & (x1 = x4) & on(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_stand(e1))