Teenager rides through the forest on his mountain bike.
The teenager is in a bike competition which is held in the forest.
That the teenager rides through the forest on his mountain bike does not imply he is participating in a bike competition.
exists e1 x1 x2 x3 x4.(n_bike(x3) & of(x3,x4) & n_mountain(x4) & of(x3,x2) & n_male(x2) & n_forest(x2) & ne_nam_teenager(x1) & on(e1,x3) & through(e1,x2) & Actor(e1,x1) & v_ride(e1))
exists p1 x1 x5.(n_forest(x5) & n_teenager(x1) & exists e1 x2 x3 x4.(in(x1,x2) & in(e1,x5) & Theme(e1,x4) & v_hold(e1) & (x2 = x4) & n_competition(x2) & of(x2,x3) & n_bike(x3)))