People sitting by the water under some trees.
People sitting under trees
Under some trees is a paraphrase of under trees.
exists e1 x1 x2 x3 x4.(n_water(x3) & a_topic(x1) & under(e1,x4) & n_tree(x4) & by(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & under(e1,x3) & n_tree(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))