Two men performing construction work.
The men sat and chatted.
If the men sat and chatted, then they couldn't have been performing construction work.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_work(x3) & of(x3,x4) & n_construction(x4) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 e2 x1.(n_man(x1) & Actor(e2,x1) & v_chat(e2) & Actor(e1,x1) & v_sit(e1))