( We ( ( ( ( add chlorine ) ( to ( the ( drinking water ) ) ) ) ( to ( kill ( ( ( ( ( bacteria , ) viruses ) , ) and ) ( ( other pathogens ) ( that ( can ( make ( people sick ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP add) (NP (NN chlorine)) (PP (TO to) (NP (DT the) (NN drinking) (NN water))) (S (VP (TO to) (VP (VB kill) (NP (NP (NNS bacteria)) (, ,) (NP (NNS viruses)) (, ,) (CC and) (NP (NP (JJ other) (NNS pathogens)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB make) (S (NP (NNS people)) (ADJP (JJ sick))))))))))))) (. .)))
We add chlorine to the drinking water to kill bacteria, viruses, and other pathogens that can make people sick.
(ROOT (S (NP (NNP Water)) (VP (MD can) (VP (VB be) (VP (VBN boiled) (S (VP (TO to) (VP (VB kill) (NP (NP (NN giardia)) (CC and) (NP (RBS most) (JJ other) (NNS pathogens))))))))) (. .)))