Many people seem to be taking a picture.
They are taking a class photo.
You don't always have to take a class photo.
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_seem(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_take(e2) & n_picture(x2)) & n_people(x1) & n_quantity(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_photo(x2) & of(x2,x1) & n_class(x1) & n_thing(x1))