Children in a field at dusk.
Kids in a field as night falls.
children at dusk is a rephrasing of kids as night falls.
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_dusk(x3) & in(x1,x2) & n_field(x2) & n_child(x1))
exists e1 x1 x2 x3.(Actor(e1,x1) & v_fall(e1) & as(x1,x3) & n_night(x3) & in(x1,x2) & n_field(x2) & n_kid(x1))