Two people are swimming in a large body of clear blue water, and there is a large red item behind them in the water.
Two swimmers with a large red ball in the background.
Two people swimming are not always considered swimmers. A large red item is not always a ball. Behind is not always considered to be in the background.
exists e1 p1 s1 s2 s3 x1 x2 x3 x4.(exists s4 s5 x5.((x4 = x5) & in(x5,x3) & behind(x5,x1) & n_item(x5) & a_red(s5) & Theme(s5,x5) & a_large(s4) & Theme(s4,x5)) & n_water(x3) & n_water(x3) & n_thing(x1) & in(e1,x2) & of(x2,x3) & a_blue(s3) & Theme(s3,x3) & a_clear(s2) & Theme(s2,x3) & n_body(x2) & a_large(s1) & Theme(s1,x2) & Actor(e1,x1) & v_swim(e1) & n_people(x1) & card_eq_2(x1))
exists s1 s2 x1 x2 x3.(n_background(x3) & a_topic(x1) & with(x1,x2) & in(x2,x3) & n_ball(x2) & a_red(s2) & Theme(s2,x2) & a_large(s1) & Theme(s1,x2) & n_swimmer(x1) & card_eq_2(x1))