A brown dog sits still on a hillside.
A cat is sleeping on a couch.
One sentence describes a dog, the other sentence describes a cat.
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_hillside(x2) & a_still(s2) & Manner(e1,s2) & Actor(e1,x1) & v_sit(e1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sleep(e1) & n_cat(x1))