( Circuits ( ( must ( be ( ( _____ ( for electricity ) ) ( to flow ) ) ) ) . ) )
(ROOT (S (NP (NNS Circuits)) (VP (MD must) (VP (VB be) (VP (VBN _____) (PP (IN for) (NP (NN electricity))) (PP (TO to) (NP (NN flow)))))) (. .)))
Circuits must be _____ for electricity to flow.
(ROOT (NP (NP (NP (DT A) (JJ parallel) (NN circuit)) (VP (VBZ is) (VP (RBS best) (VBN described) (PP (IN as))))) (: :) (NP (NP (NN electricity) (NNS flows)) (PP (IN along) (NP (QP (JJR more) (IN than) (CD one)) (NN pathway))))))