( Substances ( ( ( transport ( across membrane ) ) ( without ( ( any ( energy input ) ) ( from cell ) ) ) ) . ) )
(ROOT (S (NP (NNS Substances)) (VP (VB transport) (PP (IN across) (NP (NNP membrane))) (PP (IN without) (NP (NP (DT any) (NN energy) (NN input)) (PP (IN from) (NP (NN cell)))))) (. .)))
Substances transport across membrane without any energy input from cell.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS substances)) (VP (VBP pass) (PP (IN through) (NP (DT the) (NN cell) (NN membrane))) (PP (IN without) (S (VP (VBG needing) (NP (DT any) (NN energy)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (JJ passive) (NN transport)))) (. .)))