A dog is jumping down the stairs.
The cat is on the stairs.
A dog and a cat are two different species.
exists e1 s1 x1 x2.(n_stair(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_dog(x1))
exists p1 x1 x2.(n_stair(x2) & n_cat(x1) & on(x1,x2))