a young boy sliding on the grass in an innertube
A person is sliding down a hill.
Sliding on the grass does not necessarily imply sliding down a hill.
exists e1 s1 x1 x2 x3 x4.(n_grass(x3) & a_topic(x1) & in(e1,x4) & n_innertube(x4) & on(e1,x3) & Actor(e1,x2) & v_slide(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1) & n_hill(x2) & n_person(x1))