Two men are talking while another looks on.
Two men are talking while another reading a book.
The other man might not be reading a book, and may in fact be doing any number of tasks.
exists e1 p1 x1.(exists e2 p2 x2.(exists s1.(Theme(s1,x2) & a_on(s1)) & Topic(e2,p2) & Actor(e2,x2) & v_look(e2) & n_thing(x2)) & while(e1,p1) & Actor(e1,x1) & v_talk(e1) & n_man(x1) & card_eq_2(x1))
exists e2 e1 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_read(e2) & n_book(x3) & while(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_talk(e1) & n_man(x1) & card_eq_2(x1))