Three children run on the walkway by the river.
Three children have been playing outside all day.
Running on the walkway does not mean  that they are playing.
exists e1 x1 x2 x3.(n_river(x3) & n_walkway(x2) & on(e1,x2) & by(x2,x3) & Actor(e1,x1) & v_run(e1) & n_child(x1) & card_eq_3(x1))
exists e1 x1.(all x2.(n_day(x2) -> outside(e1,x2)) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_3(x1))