( Plants ( ( have ( been ( ( used ( in ( artificial ( wetland systems ) ) ) ) ( to ( clean ( surface ( water ( and ( wastewater streams ) ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNS Plants)) (VP (VBP have) (VP (VBN been) (VP (VBN used) (PP (IN in) (NP (JJ artificial) (JJ wetland) (NNS systems))) (S (VP (TO to) (VP (VB clean) (NP (NN surface) (NN water) (CC and) (NN wastewater) (NNS streams)))))))) (: ;)))
Plants have been used in artificial wetland systems to clean surface water and wastewater streams;
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (NN water)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (VP (VBN been) (VP (VBN used) (PP (IN for) (S (VP (VP (VBG cleaning)) (, ,) (VP (VBG washing)) (, ,) (VP (VBG flushing)) (, ,) (CC or) (VP (VBG manufacturing) (NP (NN wastewater))))))))))))) (. .)))