Two boys are ready to receive a ball at a tennis match.
There is a ball.
Just because a group of people are ready to receive a ball does not mean that there is a ball there to receive.
exists p1 s1 x1.(Topic(s1,p1) & Actor(s1,x1) & a_ready(s1) & exists e1 x2 x3 x4.(at(e1,x3) & n_match(x3) & of(x3,x4) & n_tennis(x4) & Theme(e1,x2) & Actor(e1,x1) & v_receive(e1) & n_ball(x2)) & n_boy(x1) & card_eq_2(x1))
exists p1 x1 x2.((x1 = x2) & n_ball(x2))