A woman and a boy are sitting and eating at a table.
the woman and boy are walking in the park
A woman and a boy sitting and eating at a table can't be walking in the park at the same instant.
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(at(e2,x7) & n_table(x7) & Actor(e2,x4) & v_eat(e2) & subset_of(x6,x4) & n_boy(x6) & subset_of(x5,x4) & n_woman(x5) & Actor(e1,x1) & v_sit(e1) & subset_of(x3,x1) & n_boy(x3) & subset_of(x2,x1) & n_woman(x2))
exists e1 x1 x2 x3 x4.(n_park(x4) & n_boy(x3) & n_woman(x2) & subset_of(x3,x1) & subset_of(x2,x1) & in(e1,x4) & Actor(e1,x1) & v_walk(e1))