The skateboarder is wearing a helmet.
A skateboarder is wearing a helmet.
The skateboarder almost the same as A skateboarder
exists e1 x1 x2.(n_skateboarder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2) & n_skateboarder(x1))