a group of children are standing outside a building.
a group of children are standing outside of there school during recess.
Not all buildings are schools. Just because children are standing outside a building doesn't mean it's their recess time.
exists e1 x1 x2 x3.(outside(e1,x3) & n_building(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 x1 x2 x3 x4 x5.(during(e1,x5) & n_recess(x5) & of(e1,x4) & outside(e1,x3) & n_school(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_child(x2) & n_group(x1))