Men sitting on an army tank.
The men are lounging on rafts in the swimming pool.
Men sitting on an army tank is different from men lounging on rafts.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_tank(x3) & of(x3,x4) & n_army(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_pool(x3) & of(x3,x4) & n_swimming(x4) & n_man(x1) & on(e1,x2) & in(x2,x3) & n_raft(x2) & Actor(e1,x1) & v_lounge(e1))