A tractor carrying lobster traps.
A tractor is carrying grain.
Lobster traps and grain are not the same thing.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_carry(e1) & n_trap(x3) & of(x3,x4) & n_lobster(x4) & (x1 = x2) & n_tractor(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & n_grain(x2) & n_tractor(x1))