A person on a surfboard in the ocean.
The surfer is getting ready to ride a wave.
A person on a surfboard in the ocean is not necessarily getting ready to ride a wave.
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & on(x1,x2) & in(x2,x3) & n_surfboard(x2) & n_person(x1))
exists e1 p1 x1.(n_surfer(x1) & exists p2 s1.(Topic(s1,p2) & Actor(s1,x1) & a_ready(s1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_ride(e2) & n_wave(x2))) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1))