A young girl in a yellow shirt holds a large snail.
The girl is holding a puppy.
The subject cannot be holding a puppy if she holds a snail.
exists e1 s1 s2 s3 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_snail(x3) & a_large(s3) & Theme(s3,x3) & in(x1,x2) & n_shirt(x2) & a_yellow(s2) & Theme(s2,x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_puppy(x2))