A man swings his racket at a tennis ball.
A man swings at a ball.
People usually swings at a tennis ball.
exists e1 x1 x2 x3 x4.(at(e1,x3) & n_ball(x3) & of(x3,x4) & n_tennis(x4) & Theme(e1,x2) & Actor(e1,x1) & v_swing(e1) & n_racket(x2) & of(x2,x1) & n_male(x1) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_ball(x3) & n_swing(x1) & of(x1,x2) & n_man(x2))