Thee photographers are in a park taking pictures.
Nobody is taking pictures.
If nobody is taking pictures people can not be taking pictures at the same time.
exists p1 x1 x2.(exists e1 x3 x4 x5.(in(x1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_take(e1) & n_picture(x5) & (x3 = x4) & n_park(x3)) & n_photographer(x1) & (x1 = x2) & ne_nam_thee(x2))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_picture(x2) & n_person(x1))