A boat with people and their belongings is in the water.
The group of persons are having a birthday party on the boat.
A boat with people and their belongings is in the water does not mean they are having a birthday party.
exists p1 x1 x2 x3 x4 x5.(n_water(x5) & in(x1,x5) & with(x1,x2) & subset_of(x4,x2) & n_belongings(x4) & of(x4,x1) & n_thing(x1) & subset_of(x3,x2) & n_people(x3) & n_boat(x1))
exists e1 x1 x2 x3 x4 x5.(n_boat(x5) & n_group(x1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & on(x3,x5) & n_party(x3) & of(x3,x4) & n_birthday(x4) & of(x1,x2) & n_person(x2))