But the real dirty work had already been done.
( But ( ( the ( real ( dirty work ) ) ) ( ( ( had already ) ( been done ) ) . ) ) )
(ROOT (S (CC But) (NP (DT the) (JJ real) (JJ dirty) (NN work)) (VP (VBD had) (ADVP (RB already)) (VP (VBN been) (VP (VBN done)))) (. .)))
There was no dirty work left then.
( There ( ( was ( ( no ( dirty work ) ) ( left then ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD was) (NP (NP (DT no) (JJ dirty) (NN work)) (VP (VBN left) (ADVP (RB then))))) (. .)))