A person does a flip by two sailboats and a lake.
A person stands on a dock while doing flips.
You cant infer that the person is on a dock, just because they are near water.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & subset_of(x5,x2) & n_lake(x5) & subset_of(x3,x2) & by(x3,x4) & n_sailboat(x4) & card_eq_2(x4) & n_flip(x3) & n_person(x1))
exists e1 e2 x1 x2 x3.(while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_do(e2) & n_flip(x3) & on(e1,x2) & n_dock(x2) & Actor(e1,x1) & v_stand(e1) & n_person(x1))