A man with a stroller watches another man with a camera.
A person with their child watching a photographer.
We do not know whether there person has a child with them or not.  Having a stroller is not indicative that there is a baby in the stroller.  We do not know whether the person with the camera is a photographer.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & with(x3,x4) & n_camera(x4) & n_man(x3) & -(x3 = x1) & n_man(x1) & n_man(x1) & with(x1,x2) & n_stroller(x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & n_photographer(x4) & (x1 = x3) & with(x1,x2) & n_child(x2) & of(x2,x1) & n_thing(x1) & n_person(x1))