Three construction workers are sitting in deck chairs and reading magazines.
The men were hard at work.
One cannot be reading magazines and hard at work at the same time.
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(Theme(e2,x7) & Actor(e2,x5) & v_read(e2) & n_magazine(x7) & n_worker(x5) & of(x5,x6) & n_construction(x6) & card_eq_3(x5) & in(e1,x3) & n_chair(x3) & of(x3,x4) & n_deck(x4) & Actor(e1,x1) & v_sit(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_3(x1))
exists s1 x1 x2.(n_man(x1) & at(s1,x2) & n_work(x2) & Theme(s1,x1) & a_hard(s1))