A man sits on a bridge by a river, playing the accordion.
The man is doing nothing.
A man cannot be doing nothing if he is playing the accordion.
exists e1 e2 x1 x2 x3 x4.(n_accordion(x4) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & by(e1,x3) & n_river(x3) & on(e1,x2) & n_bridge(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists x1.(n_man(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_thing(x2)))