 We always had books lots of books.
( We ( always ( ( had ( ( books lots ) ( of books ) ) ) . ) ) )
(ROOT (S (NP (PRP We)) (ADVP (RB always)) (VP (VBD had) (NP (NP (NNS books) (NNS lots)) (PP (IN of) (NP (NNS books))))) (. .)))
We had a room full of books.
( We ( ( had ( ( a room ) ( full ( of books ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBD had) (NP (NP (DT a) (NN room)) (PP (JJ full) (IN of) (NP (NNS books))))) (. .)))