Friends are sitting down for lunch on a sunny day.
People are sitting down outdoors.
Friends are people, and sunny day implies outdoors.
exists e1 s1 s2 x1 x2 x3.(on(e1,x3) & n_day(x3) & a_sunny(s2) & Theme(s2,x3) & for(e1,x2) & n_lunch(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_friend(x1))
exists e1 s1 x1 x2.(Time(e1,x2) & n_outdoors(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_people(x1))