( ( The ( electric circuit ) ) ( ( ( will not ) ( be ( closed ( unless ( ( an ( equal ( electric charge ) ) ) ( flows ( to ( ( ( the ( outer cyclinder ) ) , ) ( carried ( by ( positive ions ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ electric) (NN circuit)) (VP (MD will) (RB not) (VP (VB be) (VP (VBN closed) (SBAR (IN unless) (S (NP (DT an) (JJ equal) (JJ electric) (NN charge)) (VP (VBZ flows) (PP (TO to) (NP (NP (DT the) (JJ outer) (NN cyclinder)) (, ,) (VP (VBN carried) (PP (IN by) (NP (JJ positive) (NNS ions)))))))))))) (. .)))
The electric circuit will not be closed unless an equal electric charge flows to the outer cyclinder, carried by positive ions.
(ROOT (S (SBAR (IN Because) (S (NP (NNS charges)) (VP (MD must) (VP (VB have) (NP (DT an) (JJ unbroken) (NN path) (S (VP (TO to) (VP (VB follow))))))))) (, ,) (NP (JJ electric) (NN current)) (VP (MD can) (RB not) (VP (VB flow) (PP (IN through) (NP (DT a) (NN material))) (SBAR (IN unless) (S (NP (PRP it)) (VP (VBZ forms) (NP (DT a) (VBN closed) (NN loop))))))) (. .)))