A dog walking along a frosty path.
A bird is sitting on a brick fence.
It is either a dog or a bird, not both, and it can either be sitting or walking, not both.
exists e1 s1 x1 x2 x3.(a_topic(x1) & along(e1,x3) & n_path(x3) & a_frosty(s1) & Theme(s1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2 x3.(on(e1,x2) & n_fence(x2) & of(x2,x3) & n_brick(x3) & Actor(e1,x1) & v_sit(e1) & n_bird(x1))