A man is playing a guitar on the sidewalk.
The man is swinging a hammer.
One cannot simultaneously be playing a guitar and swinging a hammer.
exists e1 x1 x2 x3.(n_sidewalk(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_swing(e1) & n_hammer(x2))