The ball boys are waiting on the side lines of the tennis court while they watch the lady hitting the ball.
Two boys are smoking cigarettes by the tennis court, watching the lady play tennis.
Not every group of boys waiting on the side lines are smoking cigarettes.
exists e1 p1 x1 x2 x3 x4 x5 x6 x7.(n_ball(x2) & n_ball(x2) & n_lady(x7) & n_thing(x3) & n_court(x5) & of(x5,x6) & n_tennis(x6) & n_line(x3) & of(x3,x4) & n_side(x4) & n_boy(x1) & of(x1,x2) & exists e3 e2 x8.(Theme(e3,x7) & Actor(e3,x3) & v_watch(e3) & Theme(e2,x2) & Actor(e2,x8) & v_hit(e2) & (x7 = x8)) & while(e1,p1) & on(e1,x3) & of(x3,x5) & Actor(e1,x1) & v_wait(e1))
exists e1 e2 x1 x2 x3 x4 x5 x6.(n_play(x5) & of(x5,x6) & n_lady(x6) & for(e1,e2) & Time(e2,x4) & n_tennis(x4) & n_tennis(x4) & Theme(e2,x5) & Actor(e2,x1) & v_watch(e2) & by(e1,x3) & n_court(x3) & of(x3,x4) & Theme(e1,x2) & Actor(e1,x1) & v_smoke(e1) & n_cigarette(x2) & n_boy(x1) & card_eq_2(x1))