A wakeboarder catches air on a clear day at the lake.
A skateboarder is riding at the park.
A skateboarder at  park is different than a wakeboarder at a lake.
exists e1 s1 x1 x2 x3 x4.(n_lake(x4) & on(e1,x3) & at(x3,x4) & n_day(x3) & a_clear(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_air(x2) & n_wakeboarder(x1))
exists e1 x1 x2.(n_park(x2) & at(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboarder(x1))