A man skateboarding outside balancing his skateboard on a beam.
The skateboarder is playing chess.
The person cannot simultaneously be skateboarding and playing chess
exists e2 e1 s1 x1 x2 x3 x4.(a_topic(x1) & for(e1,e2) & Theme(e2,x3) & Actor(e2,x2) & v_balance(e2) & on(x3,x4) & n_beam(x4) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x2) & v_skateboard(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_skateboarder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_chess(x2))