A boy in blue and white on rollerskates holds hockey stick with a black ball at the end of it.
A boy is trying to practice before his hockey game
boy on rollerskates holding hockey stick does not imply he is trying to practice before the game.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8.(n_end(x8) & with(e1,x7) & at(x7,x8) & of(x8,x1) & n_thing(x1) & n_ball(x7) & a_black(s2) & Theme(s2,x7) & Theme(e1,x6) & Actor(e1,x1) & v_hold(e1) & n_stick(x6) & a_hockey(s1) & Theme(s1,x6) & on(x1,x5) & n_rollerskate(x5) & in(x1,x2) & n_white(x4) & n_blue(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_boy(x1))
exists e1 p1 x1 x2 x3.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(before(e2,x2) & Actor(e2,x1) & v_practice(e2)) & n_game(x2) & of(x2,x3) & n_hockey(x3) & of(x2,x1) & n_male(x1) & n_boy(x1))