Men building a sand castle in shallow water.
The men are contestants in a sandcastle building contest.
Men building a sand castle don't have to be contestants in a sandcastle building contest.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_water(x5) & a_shallow(s1) & Theme(s1,x5) & Theme(e1,x3) & Actor(e1,x2) & v_build(e1) & n_castle(x3) & of(x3,x4) & n_sand(x4) & (x1 = x2) & n_man(x1))
exists p1 s1 x1 x2 x3.(n_man(x1) & in(p1,x2) & n_contest(x2) & of(x2,x3) & n_building(x3) & a_sandcastle(s1) & Theme(s1,x2) & exists x4.((x1 = x4) & n_contestant(x4)))