A man playing a guitar while sitting on a chair indoors.
A man plays some Eric Clapton.
A man playing the guitar does not mean he is playing Eric Clapton. He could play anything.
exists e2 e1 x1 x2 x3 x4 x5.(a_topic(x1) & while(e1,e2) & on(e2,x4) & n_indoor(x4) & of(x4,x5) & n_chair(x5) & Actor(e2,x2) & v_sit(e2) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & ne_org_clapton(x2) & (x2 = x3) & ne_org_eric(x3) & n_man(x1))