( Pouring ( ( ( used ( motor oil ) ) ( down ( a ( storm drain ) ) ) ) . ) )
(ROOT (S (NP (NNP Pouring)) (VP (VBD used) (NP (NN motor) (NN oil)) (PP (IN down) (NP (DT a) (NN storm) (NN drain)))) (. .)))
Pouring used motor oil down a storm drain.
(ROOT (S (NP (NNP Motor) (NN oil)) (VP (VBZ is) (NP (NP (DT a) (JJ harmful) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD must) (RB not) (VP (VB be) (VP (VBN drained) (PP (IN into) (NP (DT a) (NN storm) (NN sewer)))))))))) (. .)))