A couple relax on a patch of grass with a body of water behind them.
lovers lay down near a lake
Being a couple does not necessarily mean that they are lovers.  Relaxing does not always involve laying down.
exists e1 x1 x2 x3 x4 x5.(with(e1,x4) & behind(x4,x1) & n_thing(x1) & of(x4,x5) & n_water(x5) & n_body(x4) & on(e1,x2) & of(x2,x3) & n_grass(x3) & n_patch(x2) & Actor(e1,x1) & v_relax(e1) & n_couple(x1))
exists e1 s1 x1 x2.(near(e1,x2) & n_lake(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_lay(e1) & n_lover(x1))