Two people are reading something while sitting on a bench.
Two people read books while waiting on a bench.
People reading something does not necessarily mean the people read books and sitting does not necessarily mean waiting.
exists e2 e1 x1 x2 x3.(while(e1,e2) & on(e2,x3) & n_bench(x3) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_thing(x2) & n_people(x1) & card_eq_2(x1))
exists e2 e1 x1 x2 x3.(while(e1,e2) & on(e2,x3) & n_bench(x3) & Actor(e2,x1) & v_wait(e2) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_book(x2) & n_people(x1) & card_eq_2(x1))