People standing in mud.
Some people sit on lawnchairs.
One cannot sit and stand at the same time.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_mud(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(on(e1,x2) & n_lawnchair(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))