Four people watch the sunset.
Four people sit together and watch the sun set.
The people could be standing, it is not required that they sit to watch a sunset.
exists e1 x1 x2.(n_sunset(x2) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_people(x1) & card_eq_4(x1))
exists e2 e1 s1 x1 x2 x3 x4.(n_set(x3) & of(x3,x4) & n_sun(x4) & Theme(e2,x3) & Actor(e2,x2) & v_watch(e2) & n_people(x2) & card_eq_4(x2) & a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))