A dog walking across the desert.
A dog sits in a forest.
Sits and walking are opposites.
exists x1 x2 x3.(n_desert(x3) & a_topic(x1) & across(x1,x3) & n_walking(x1) & of(x1,x2) & n_dog(x2))
exists e1 x1 x2.(in(e1,x2) & n_forest(x2) & Actor(e1,x1) & v_sit(e1) & n_dog(x1))