A man is in the middle of a skateboard trick in front of a gray building.
A man is doing a skateboard trick down some stairs in front of a skyscraper.
Not all the gray building are skyscraper
exists p1 x1 x2.(n_middle(x2) & exists s1 x3 x4 x5 x6.(in(x1,x2) & of(x2,x3) & in(x3,x5) & of(x5,x6) & n_building(x6) & a_gray(s1) & Theme(s1,x6) & n_front(x5) & n_trick(x3) & of(x3,x4) & n_skateboard(x4)) & n_man(x1))
exists e1 x1 x2 x3 x4 x5 x6.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & down(x2,x4) & in(x4,x5) & of(x5,x6) & n_skyscraper(x6) & n_front(x5) & n_stair(x4) & n_trick(x2) & of(x2,x3) & n_skateboard(x3) & n_man(x1))