A man is doing a trick on his bike in a skatepark.
The man is a professional biker.
Just because he is doing a trick on his bike doesn't make him a professional.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_skatepark(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_bike(x3) & of(x3,x1) & n_male(x1) & n_trick(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists s1 x2.((x1 = x2) & n_biker(x2) & a_professional(s1) & Theme(s1,x2)))