a beach with blue and red boats, with people on shore
The boats are sailboats.
Not all boats are sailboats.
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & with(x2,x3) & on(x3,x4) & n_shore(x4) & n_people(x3) & n_boat(x2) & a_red(s2) & Theme(s2,x2) & a_blue(s1) & Theme(s1,x2) & n_beach(x1))
exists p1 x1.(n_boat(x1) & exists x2.((x1 = x2) & n_sailboat(x2)))