A little girl is chopping a worm with a knife.
The little girl is dissecting a frog.
Dissecting and chopping are two very different things. Dissecting means to carefully open up and inspect a (normally) preserved animal while chopping means to cut up. Also, a worm and a frog are two different animals.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_chop(e1) & with(x2,x3) & n_knife(x3) & n_worm(x2) & n_girl(x1) & a_little(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_girl(x1) & a_little(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_dissect(e1) & n_frog(x2))