a group of children are standing outside a building.
some children are outside standing.
Some children is a rephrasing of a group of children and to be outside a building shows the building is outside.
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 p1 x1.(exists s1 x2.((x1 = x2) & n_standing(x2) & a_outside(s1) & Theme(s1,x2)) & n_child(x1))