A man swinging at a tennis ball with a green sign that read findersport.
A man practices serving to a friend with his tennis racket.
Just because a man is swinging a tennis racket or something does not mean that this is simply practice. A man practices, yes, but this could be a game in Earnest. Also there is no guarantee that the person he is playing or practicing with is his friend. It could be a stranger or a co-worker or a spouse or anything. He could be serving to his tennis teacher for all we know.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & at(e1,x3) & with(x3,x5) & Theme(e2,x7) & Actor(e2,x6) & v_read(e2) & n_findersport(x7) & (x5 = x6) & n_sign(x5) & a_green(s1) & Theme(s1,x5) & n_ball(x3) & of(x3,x4) & n_tennis(x4) & Actor(e1,x2) & v_swing(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & with(e1,x5) & n_racket(x5) & of(x5,x6) & n_tennis(x6) & of(x5,x1) & n_male(x1) & to(e1,x4) & n_friend(x4) & Actor(e1,x3) & v_serve(e1) & (x1 = x3) & n_practice(x1) & of(x1,x2) & n_man(x2))