A woman and child stand on the beach while sailboats sail on the ocean.
mom and son watch sailboats
the child does not have to be a boy and the woman might not be the mom
(-x)
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_watch(e1) & n_sailboat(x4) & subset_of(x3,x1) & n_son(x3) & subset_of(x2,x1) & n_mom(x2))