A man in a green shirt is playing volleyball.
Two men on skates.
A man means one. One cannot play volleyball and  skate simultaneously.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_volleyball(x3) & in(x1,x2) & n_shirt(x2) & a_green(s1) & Theme(s1,x2) & n_man(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_skate(x2) & n_man(x1) & card_eq_2(x1))