( Often ( ( all ( the networks ) ) ( ( are ( connected ( to ( a ( common ( backbone network ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Often)) (NP (PDT all) (DT the) (NNS networks)) (VP (VBP are) (VP (VBN connected) (PP (TO to) (NP (DT a) (JJ common) (NN backbone) (NN network))))) (. .)))
Often all the networks are connected to a common backbone network.
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (JJ main) (NNS features)) (SBAR (S (NP (DT all) (NNS vetebrates)) (VP (VBP have) (VP (PP (IN in) (NP (JJ common)))))))))) (VP (VBZ is) (NP (DT a) (NN backbone))) (. .)))