Guys digging around a tree in the ground.
Guys are digging in the ground
A tree in the ground is by definition in the ground.
exists e1 x1 x2 x3.(n_ground(x3) & ne_nam_guys(x1) & in(e1,x3) & around(e1,x2) & n_tree(x2) & Actor(e1,x1) & v_dig(e1))
exists e1 x1 x2.(n_ground(x2) & in(e1,x2) & Actor(e1,x1) & v_dig(e1) & n_guy(x1))