A man is standing behind a giant green machine.
A man prepares to repair the green machine.
Just because a man stands behind a machine does not mean that he will repair it.
exists e1 s1 s2 x1 x2.(behind(e1,x2) & n_machine(x2) & a_green(s2) & Theme(s2,x2) & a_giant(s1) & Theme(s1,x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists e1 p1 s1 x1 x2.(n_machine(x2) & a_green(s1) & Theme(s1,x2) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_repair(e2)) & n_man(x1))