There is a person standing on top of a stairway outside of a Costco store.
The person was waiting for his wife and children outside the store.
Standing does not imply waiting for anyone else.
exists p1 x1 x2 x3 x4 x5 x6 x7 x8.((x1 = x2) & on(x2,x4) & of(x4,x5) & of(x6,x7) & n_store(x7) & of(x7,x8) & n_costco(x8) & outside(x5,x6) & n_thing(x6) & n_stairway(x5) & n_top(x4) & n_standing(x2) & of(x2,x3) & n_person(x3))
exists e1 x1 x2 x3 x4 x5.(n_store(x5) & n_wife(x3) & of(x3,x1) & n_male(x1) & n_person(x1) & for(e1,x2) & subset_of(x4,x2) & outside(x4,x5) & n_child(x4) & subset_of(x3,x2) & Actor(e1,x1) & v_wait(e1))