A man is mortaring bricks.
The man is building a wall.
Mortaring bricks does not mean building a wall.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_mortar(e1) & n_brick(x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_wall(x2))