Recked ambulance being towed by a large tow truck.
The ambulance was towed after it wrecked.
An ambulance could be wrecked and being towed by a large tow truck.
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & Actor(e2,x3) & n_truck(x3) & of(x3,x4) & n_tow(x4) & a_large(s1) & Theme(s1,x3) & Theme(e2,x2) & v_tow(e2) & (x1 = x2) & n_ambulance(x1) & Theme(e1,x1) & v_reck(e1))
exists e1 p1 x1.(n_thing(x1) & n_ambulance(x1) & exists e2.(Actor(e2,x1) & v_wreck(e2)) & after(e1,p1) & Theme(e1,x1) & v_tow(e1))