People stand in the surf.
The people are on the lounge chairs.
To stand implies not being in chairs.
exists e1 x1 x2.(n_surf(x2) & in(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists p1 x1 x2 x3.(n_chair(x2) & of(x2,x3) & n_lounge(x3) & n_people(x1) & on(x1,x2))