Boys outside a building.
The boys are waiting outside for their parents.
They may be outside the building for some reason other than waiting for their parents.
exists x1 x2.(a_topic(x1) & outside(x1,x2) & n_building(x2) & n_boy(x1))
exists e1 s1 x1 x2.(n_parent(x2) & of(x2,x1) & n_thing(x1) & n_boy(x1) & for(e1,x2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_wait(e1))