A man on a snowboard travels downhill towards the camera.
A man riding a snowboard is doing some hard tricks while traveling downhill.
A man can travel downhill on a snowboard without doing hard tricks.
exists e1 p1 x1 x2 x3.(n_camera(x3) & towards(e1,x3) & exists s1.(Theme(s1,x1) & a_downhill(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_travel(e1) & on(x1,x2) & n_snowboard(x2) & n_man(x1))
exists e1 e3 e2 s1 x1 x2 x3 x4 x5.(while(e2,e3) & Theme(e3,x5) & Actor(e3,x1) & v_travel(e3) & n_downhill(x5) & Theme(e2,x4) & Actor(e2,x1) & v_do(e2) & n_trick(x4) & a_hard(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_snowboard(x3) & (x1 = x2) & n_man(x1))