Tourist Information offices can be very helpful.
( ( Tourist ( Information offices ) ) ( ( can ( be ( very helpful ) ) ) . ) )
(ROOT (S (NP (NNP Tourist) (NNP Information) (NNS offices)) (VP (MD can) (VP (VB be) (ADJP (RB very) (JJ helpful)))) (. .)))
Tourist Information offices are never of any help.
( ( Tourist ( Information offices ) ) ( ( ( are never ) ( of ( any help ) ) ) . ) )
(ROOT (S (NP (NNP Tourist) (NNP Information) (NNS offices)) (VP (VBP are) (ADVP (RB never)) (PP (IN of) (NP (DT any) (NN help)))) (. .)))