A small dog jumps over a yellow beam.
A  chihuahua jumps over a beam.
Not every small dog is a chihuahua.
exists s1 s2 x1 x2 x3.(a_topic(x1) & over(x1,x3) & n_beam(x3) & a_yellow(s2) & Theme(s2,x3) & n_jump(x1) & of(x1,x2) & n_dog(x2) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2.(over(e1,x2) & n_beam(x2) & Actor(e1,x1) & v_jump(e1) & n_chihuahua(x1))