People are walking under trees while other are sitting down.
People are doing different things outside.
People are outside doing different things.
exists e1 p1 x1 x2.(exists e2 s1 x3.(a_down(s1) & Manner(e2,s1) & Actor(e2,x3) & v_sit(e2) & n_other(x3)) & while(e1,p1) & under(e1,x2) & n_tree(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 s1 x1 x2 x3.(n_thing(x3) & a_outside(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & -(x2 = x3) & n_thing(x2) & n_people(x1))