A group of men are planting a tree.
There are some people and a plant.
A tree is a plant.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_plant(e1) & n_tree(x3) & of(x1,x2) & n_man(x2) & n_group(x1))
exists p1 x1 x2 x3 x4.((x1 = x2) & subset_of(x4,x2) & n_plant(x4) & subset_of(x3,x2) & n_people(x3))