Children are performing a routine on stage.
Children having a play at their school
Just because children are performing on a stage does not mean that they are having a play at their school.
exists e1 x1 x2 x3.(on(e1,x3) & n_stage(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_routine(x2) & n_child(x1))
exists e1 x1 x2 x3.(ne_nam_children(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & at(x2,x3) & n_school(x3) & of(x3,x2) & n_thing(x2) & n_play(x2))