People are walking under trees while other are sitting down.
People are working in cubicles
people cannot be walking and working in cubicles at the same time
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 x1 x2.(in(e1,x2) & n_cubicle(x2) & Actor(e1,x1) & v_work(e1) & n_people(x1))