A skateboarder at night on a ramp.
The skateboared is on the ramp
The skateboarder is on the ramp is skateboarding at night.
exists x1 x2 x3.(a_topic(x1) & at(x1,x2) & on(x2,x3) & n_ramp(x3) & n_night(x2) & n_skateboarder(x1))
exists p1 x1 x2.(n_ramp(x2) & n_skateboared(x1) & on(x1,x2))