People are taking pictures across the water.
people taking pictures
People are taking pictures is a paraphrase of people taking pictures.
exists e1 x1 x2 x3.(n_water(x3) & across(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_picture(x2) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & n_picture(x3) & (x1 = x2) & n_people(x1))