A man is backpacking up a grassy hill.
A guy is walking in a place where there is grass.
Backpacking requires walking and a grassy hill is a place where there is grass.
exists e1 s1 s2 x1 x2.(a_up(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_backpack(e1) & n_hill(x2) & a_grassy(s1) & Theme(s1,x2) & n_man(x1))
exists e1 p1 x1 x2.(in(e1,x2) & exists p2 x3 x4.((x3 = x4) & n_grass(x4)) & where(x2,p1) & n_place(x2) & Actor(e1,x1) & v_walk(e1) & n_guy(x1))