children playing an informal game of hockey
A group of boys complete speed skating drills.
Can't play informal hockey and and complete speed skating drills simultaneously
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & of(x3,x4) & n_hockey(x4) & n_game(x3) & a_informal(s1) & Theme(s1,x3) & (x1 = x2) & n_child(x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & n_drill(x2) & Actor(e1,x2) & v_skate(e1) & of(x2,x4) & n_speed(x4) & a_complete(s1) & Theme(s1,x2) & of(x2,x3) & n_boy(x3) & n_group(x1))