A person in the water getting ready to waterski on their feet.
The person is swimming.
The person can't be swimming if they are ready to waterski.
exists e1 p1 x1 x2 x3 x4.(n_foot(x4) & of(x4,x2) & n_thing(x2) & n_water(x2) & a_topic(x1) & in(x1,x2) & exists p2 s1.(Topic(s1,p2) & Actor(s1,x3) & a_ready(s1) & exists e2.(on(e2,x4) & Actor(e2,x3) & v_waterski(e2))) & Topic(e1,p1) & Actor(e1,x3) & v_get(e1) & (x2 = x3) & n_person(x1))
exists p1 x1.(n_person(x1) & exists x2.((x1 = x2) & n_swimming(x2)))