A dog is jumping in some sand.
A squirrel sleeps in a tree.
dog is jumping .is not the same as squirrel sleeps
exists e1 x1 x2.(in(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_jump(e1) & n_dog(x1))
exists e1 x1 x2.(in(e1,x2) & n_tree(x2) & Actor(e1,x1) & v_sleep(e1) & n_squirrel(x1))