A man wearing shorts and a tank top riding a skateboard.
The man is wearing a helmet.
It is not sure whether he is wearing a helmet
exists e2 e1 s1 x1 x2 x3 x4 x5.(Theme(e2,x5) & Actor(e2,x3) & v_ride(e2) & n_skateboard(x5) & Theme(s1,x4) & a_top(s1) & (x3 = x4) & n_tank(x3) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_shorts(x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2))