( ( Bacteria ( which ( grow ( in ( the ( oral cavity ) ) ) ) ) ) ( ( can ( be ( aspirated ( into ( ( the lungs ) ( which ( may ( help ( to ( cause ( ( respiratory diseases ) ( such ( as ( pneumonia ( , ( ( bronchitis and ) emphysema ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Bacteria)) (SBAR (WHNP (WDT which)) (S (VP (VBP grow) (PP (IN in) (NP (DT the) (JJ oral) (NN cavity))))))) (VP (MD can) (VP (VB be) (VP (VBN aspirated) (PP (IN into) (NP (NP (DT the) (NNS lungs)) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB help) (S (VP (TO to) (VP (VB cause) (NP (NP (JJ respiratory) (NNS diseases)) (PP (JJ such) (IN as) (NP (NN pneumonia) (, ,) (NNS bronchitis) (CC and) (NN emphysema)))))))))))))))) (. .)))
Bacteria which grow in the oral cavity can be aspirated into the lungs which may help to cause respiratory diseases such as pneumonia, bronchitis and emphysema.
(ROOT (S (NP (NNP Pneumonia) (CC and) (NN emphysema) (NNS illnesses)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NN damage))) (PP (TO to) (NP (NP (DT the) (NNS alveoli)) (PP (IN of) (NP (DT the) (NNS lungs))))))) (. .)))