A wrecked ambulance is being towed.
An ambulance with a smashed front is being towed.
A wrecked ambulance does not have to have a smashed front.
exists e1 s1 x1.(Theme(e1,x1) & v_tow(e1) & n_ambulance(x1) & a_wrecked(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(Theme(e1,x1) & v_tow(e1) & with(x1,x2) & n_front(x2) & a_smashed(s1) & Theme(s1,x2) & n_ambulance(x1))