A wrecked ambulance is being towed.
A sunflower alone in a field.
one is about an ambulance while the other is about a sunflower
exists e1 s1 x1.(Theme(e1,x1) & v_tow(e1) & n_ambulance(x1) & a_wrecked(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_field(x2) & r_alone(x1) & n_sunflower(x1))