People are eating a table.
People are eating a table on a table.
Just because People are eating a table does not imply that they are eating a table on a table.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_table(x2) & n_people(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & on(x2,x3) & n_table(x3) & n_table(x2) & n_people(x1))