A child is sliding down a hill on a sled.
A child went sledding after a fresh snow.
The child may have gone sledding at a different time than when he slid down on a sled.  The fresh snow could have been another time.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1) & on(x2,x3) & n_sled(x3) & n_hill(x2) & n_child(x1))
exists e1 p1 x1.(exists e2 s1 x2.(after(e2,x2) & n_snow(x2) & a_fresh(s1) & Theme(s1,x2) & Actor(e2,x1) & v_sled(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_go(e1) & n_child(x1))