Man in gray shirt sitting on ground playing guitar.
The man is standing up.
He cannot be sitting and standing up at the same time.
exists e1 e2 s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & for(e1,e2) & Theme(e2,x5) & Actor(e2,x3) & v_play(e2) & n_guitar(x5) & on(e1,x4) & n_ground(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_shirt(x2) & a_gray(s1) & Theme(s1,x2) & n_man(x1))
exists e1 s1 x1.(n_man(x1) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1))