A child stands on the porch.
A child is waiting for its father to come home on the porch.
A child can stand on a porch for reasons other than waiting for its father to come home.
exists e1 x1 x2.(n_porch(x2) & on(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_child(x1))
exists e1 p1 x1 x2 x3 x5.(n_porch(x5) & Topic(e1,p1) & exists e2 x4.(on(e2,x5) & Time(e2,x4) & n_home(x4) & Actor(e2,x1) & v_come(e2)) & for(e1,x3) & n_father(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x2) & v_wait(e1) & n_child(x2) & n_child(x1))