Four people standing on a boat on the lake.
A group of people stand in the grass.
The boat is on water, while grass is on land. People can't stand on both simultaneously.
exists e1 x1 x2 x3 x4.(n_lake(x4) & a_topic(x1) & on(e1,x4) & on(e1,x3) & n_boat(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(n_grass(x3) & in(e1,x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))