A young boy was watching a goose.
The goose was being observed.
When someone is watching something then the thing is being observed.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_goose(x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(n_goose(x1) & Theme(e1,x1) & v_observe(e1))