A man in a black and yellow jacket is snowboarding, while others stand in the background.
A man is in a snowboarding competion.
A man snowboarding in front of people does not imply that he is in a snowboarding competition.
exists e1 p1 s1 s2 x1 x2 x4.(n_background(x4) & exists e2 x3.(in(e2,x4) & Actor(e2,x3) & v_stand(e2) & -(x3 = x1) & n_person(x3)) & n_person(x1) & while(e1,p1) & Actor(e1,x1) & v_snowboard(e1) & in(x1,x2) & n_jacket(x2) & a_yellow(s2) & Theme(s2,x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1.(exists e1 x2.(in(x1,x2) & n_competion(x2) & Actor(e1,x2) & v_snowboard(e1)) & n_man(x1))