The young man with black pants and a white t-shirt is riding along the top of the wall with his skateboard.
The young man is at a skate park.
The young man who is riding along the top of the wall with his skateboard in not necessarily at a skate park.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(n_skateboard(x7) & of(x7,x1) & n_male(x1) & n_wall(x6) & n_top(x5) & n_man(x1) & a_young(s1) & Theme(s1,x1) & along(e1,x5) & of(x5,x6) & with(x6,x7) & Actor(e1,x1) & v_ride(e1) & with(x1,x2) & subset_of(x4,x2) & n_t-shirt(x4) & a_white(s3) & Theme(s3,x4) & subset_of(x3,x2) & n_pants(x3) & a_black(s2) & Theme(s2,x3))
exists p1 s1 x1.(n_man(x1) & a_young(s1) & Theme(s1,x1) & exists x2 x3.(at(x1,x2) & n_park(x2) & of(x2,x3) & n_skate(x3)))