A young man standing on a patio.
A young man is standing on the patio waiting for someone.
A young man standing on a patio is not necessarily waiting for someone.
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_patio(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 e2 s1 x1 x2 x3.(n_patio(x2) & for(e1,e2) & for(e2,x3) & n_person(x3) & Actor(e2,x1) & v_wait(e2) & on(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))