A young man is skateboarding in a skate park.
A male is at the park.
the person skateboarding in the park  is young
exists e1 s1 x1 x2 x3.(in(e1,x2) & n_park(x2) & of(x2,x3) & n_skate(x3) & Actor(e1,x1) & v_skateboard(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_park(x2) & at(x1,x2) & n_male(x1))