A skateboarder riding a rail.
A man parachutes in the desert for the first time.
It is unlikely that the man would be skateboarding in the dessert. There are no rails in the dessert. One cannot parachute and skateboard simultaneously.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_rail(x3) & (x1 = x2) & n_skateboarder(x1))
exists e1 s1 x1 x2 x3.(n_time(x3) & a_first(s1) & Theme(s1,x3) & n_desert(x2) & for(e1,x3) & in(e1,x2) & Actor(e1,x1) & v_parachute(e1) & n_man(x1))