( ( Anaerobic bacteria ) ( ( ( can not ) ( grow ( when ( oxygen ( is present ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Anaerobic) (NNS bacteria)) (VP (MD can) (RB not) (VP (VB grow) (SBAR (WHADVP (WRB when)) (S (NP (NN oxygen)) (VP (VBZ is) (ADJP (JJ present))))))) (. .)))
Anaerobic bacteria cannot grow when oxygen is present.
(ROOT (S (NP (JJ Anaerobic) (NN respiration)) (VP (VBZ occurs) (SBAR (IN if) (S (NP (NN oxygen)) (VP (MD can) (RB not) (VP (VB be) (VP (VBN obtained) (PP (IN at) (NP (DT a) (JJ sufficient) (NN rate))))))))) (. .)))