Man are standing on scaffolding and working on a building.
Men are eating lunch in a park.
Man means one, men is more than one, It is not possible to be working on a building and eating lunch in a park at the same time.
exists e1 e2 x1 x2 x3 x4.(on(e2,x4) & n_building(x4) & Actor(e2,x3) & v_work(e2) & n_man(x3) & on(e1,x2) & n_scaffolding(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_park(x3) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_lunch(x2) & n_man(x1))