A man at a park is taking pictures.
A man takes pictures.
man at a park is taking pictures simply means man takes pictures
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_picture(x3) & at(x1,x2) & n_park(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_picture(x2) & n_man(x1))