Two men performing construction work.
They were doing work.
performing implies doing
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 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_work(x2))