This is a good map for tourists.
Tourists are doing a walking tour of Rome.
From sentence one, we cannot infer what the tourists are doing. Sentence two lets us know they are doing a walking tour of Rome.
exists p1 x1.(n_thing(x1) & exists s1 x2 x3.((x1 = x2) & for(x2,x3) & n_tourist(x3) & n_map(x2) & a_good(s1) & Theme(s1,x2)))
exists e1 x1 x2 x3 x4.(ne_geo_rome(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & of(x2,x4) & n_tour(x2) & of(x2,x3) & n_walking(x3) & n_tourist(x1))