A knife cutting into a piece of fish.
A fork is sticking in a potato.
The utensil is either a knife or fork, and it is either in fish or a potato.
exists e1 x1 x2 x3 x4.(a_topic(x1) & into(e1,x3) & of(x3,x4) & n_fish(x4) & n_piece(x3) & Actor(e1,x2) & v_cut(e1) & (x1 = x2) & n_knife(x1))
exists e1 x1 x2.(in(e1,x2) & n_potato(x2) & Actor(e1,x1) & v_stick(e1) & n_fork(x1))