A construction crew works on demolishing a building.
A new building is being constructed.
a building can't be demolished and constructed at the same time
exists e1 e2 x1 x2 x3 x4.(on(e1,e2) & Theme(e2,x4) & Actor(e2,x3) & v_demolish(e2) & n_building(x4) & Actor(e1,x1) & v_work(e1) & n_crew(x1) & of(x1,x2) & n_construction(x2))
exists e1 s1 x1.(Theme(e1,x1) & v_construct(e1) & n_building(x1) & a_new(s1) & Theme(s1,x1))