A young colored boy crying while on the skateboard.
The young boy is skiing down a hill and laughing.
One cannot do skateboard and skiing simultaneously.
exists e1 e2 s1 x1 x2 x3.(n_skateboard(x3) & a_topic(x1) & on(e2,x3) & r_while(e2) & Actor(e2,x2) & v_cry(e2) & (x1 = x2) & n_boy(x1) & Theme(e1,x1) & v_color(e1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3 x4.(n_boy(x1) & a_young(s1) & Theme(s1,x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_ski(e1) & n_laughing(x4) & n_hill(x3) & subset_of(x4,x2) & subset_of(x3,x2))