A man and a woman, standing on a boat, observing something.
Some people are watching something.
Observing does not necessarily imply watching something.
exists e1 e2 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & for(e1,e2) & Theme(e2,x5) & Actor(e2,x3) & v_observe(e2) & n_thing(x5) & on(e1,x4) & n_boat(x4) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_thing(x2) & n_people(x1))