( Pneumonia ( ( occurs ( when ( ( ( ( the ( tiny airsacs ) ) ( -LRB- ( alveoli -RRB- ) ) ) ( which ( ( make up ) ( ( the ( working part ) ) ( of ( the lungs ) ) ) ) ) ) ( fill ( with ( pus ( or ( other fluids ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Pneumonia)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (JJ tiny) (NNS airsacs)) (PRN (-LRB- -LRB-) (NP (NNP alveoli)) (-RRB- -RRB-)) (SBAR (WHNP (WDT which)) (S (VP (VBP make) (PRT (RP up)) (NP (NP (DT the) (VBG working) (NN part)) (PP (IN of) (NP (DT the) (NNS lungs)))))))) (VP (VBP fill) (PP (IN with) (NP (NN pus) (CC or) (JJ other) (NNS fluids))))))) (. .)))
Pneumonia occurs when the tiny airsacs (alveoli) which make up the working part of the lungs fill with pus or other fluids.
(ROOT (S (NP (DT The) (NN term) (NN pneumonia)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (NN disease)) (SBAR (WHADVP (WRB where)) (S (NP (NP (DT some)) (PP (IN of) (NP (NP (DT the) (NNS alveoli)) (PP (IN of) (NP (DT the) (NNS lungs)))))) (VP (VBP fill) (PP (IN with) (NP (NN fluid))) (SBAR (IN so) (S (NP (PRP they)) (VP (MD can) (ADVP (RB no) (RB longer)) (VP (VB exchange) (NP (NN gas))))))))))))) (. .)))