( ( ( Their toilet ) ( ( uses ( 4 gallons ) ) ( ( every time ) ( it ( is flushed ) ) ) ) ) ( , ( They ( ( installed ( ( a ( new toilet ) ) ( that ( only ( uses ( ( 2 gallons ) ( of ( water ( per flush ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (PRP$ Their) (NN toilet)) (VP (VBZ uses) (NP (CD 4) (NNS gallons)) (NP (NP (DT every) (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ is) (VP (VBN flushed)))))))) (, ,) (NP (PRP They)) (VP (VBD installed) (NP (NP (DT a) (JJ new) (NN toilet)) (SBAR (WHNP (WDT that)) (S (ADVP (RB only)) (VP (VBZ uses) (NP (NP (CD 2) (NNS gallons)) (PP (IN of) (NP (NP (NN water)) (PP (IN per) (NP (NN flush))))))))))) (. .)))
Their toilet uses 4 gallons every time it is flushed, They installed a new toilet that only uses 2 gallons of water per flush.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG flushing) (NP (DT the) (NN toilet))))) (, ,) (VP (VBN performed) (NP (JJ multiple) (NNS times)) (ADVP (RB daily))) (, ,)) (VP (VBZ is) (NP (NP (DT the) (ADJP (JJ single) (JJS biggest)) (NN use)) (PP (IN of) (NP (NP (NN water)) (PP (IN in) (NP (DT the) (NN home))))))) (. .)))