What did you enjoy about reading the Lewis and Clark journals?
( What ( ( ( did you ) ( enjoy ( about ( reading ( the ( Lewis ( and ( Clark journals ) ) ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHNP (WP What)) (SQ (VBD did) (NP (PRP you)) (VP (VB enjoy) (PP (IN about) (S (VP (VBG reading) (NP (DT the) (NNP Lewis) (CC and) (NNP Clark) (NNS journals))))))) (. ?)))
The Lewis and Clark journals must have been boring reading. 
( ( The ( Lewis ( and ( Clark journals ) ) ) ) ( ( must ( have ( been ( boring reading ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Lewis) (CC and) (NNP Clark) (NNS journals)) (VP (MD must) (VP (VB have) (VP (VBN been) (VP (VBG boring) (NP (NN reading)))))) (. .)))