Two men are sitting working on their computers.
Two men work hard on a work assignment.
Not all men are sitting working on their computers work hard on a work assignment.
exists e2 e1 x1 x2.(for(e1,e2) & on(e2,x2) & n_computer(x2) & of(x2,x1) & n_thing(x1) & Actor(e2,x1) & v_work(e2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(on(e1,x2) & n_assignment(x2) & of(x2,x3) & n_work(x3) & a_hard(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_2(x1))