A group of people are sitting on the top of a boat.
The people are swimming
The people are either sitting on the top of a boat or swimming.
exists e1 x1 x2 x3 x4.(n_top(x3) & on(e1,x3) & of(x3,x4) & n_boat(x4) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1.(n_people(x1) & Actor(e1,x1) & v_swim(e1))