Some guys are having a conversation.
Men talking.
Guys is a more informal term for men, and having a conversation means they are talking.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_conversation(x2) & n_guy(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_talking(e1) & (x1 = x2) & n_man(x1))