A football player is catching the football.
A football player completing a pass.
A football player completing a pass refers to a football player  is catching the football.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_football(x2) & n_football(x2) & n_player(x1) & of(x1,x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_complete(e1) & n_pass(x4) & (x1 = x3) & n_player(x1) & of(x1,x2) & n_football(x2))