A teenager is attempting a skateboarding trick in an urban area.
A teenage runs around a skate park
The difference is the skateboarding trick and the urban area and the running around the skate park.  Also there is the teenage and the teenager.
exists e2 e1 s1 x1 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_attempt(e2) & in(x2,x3) & n_area(x3) & a_urban(s1) & Theme(s1,x3) & n_trick(x2) & Actor(e1,x2) & v_skateboard(e1) & n_teenager(x1))
exists e1 x1 x2 x3.(around(e1,x2) & n_park(x2) & of(x2,x3) & n_skate(x3) & Actor(e1,x1) & v_run(e1) & n_teenage(x1))