So, that was such a racy and shocking book at that time, and so, of course, we had to read it.
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(ROOT (S (IN So) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBD was) (NP (NP (JJ such) (DT a) (ADJP (JJ racy) (CC and) (JJ shocking)) (NN book)) (PP (IN at) (NP (DT that) (NN time))) (, ,) (ADVP (CC and) (RB so)) (, ,) (PP (IN of) (NP (NN course))))))) (, ,) (NP (PRP we)) (VP (VBD had) (S (VP (TO to) (VP (VB read) (NP (PRP it)))))) (. .)))
We had to read the book but we thought it was very interesting.
( ( ( ( We ( had ( to ( read ( the book ) ) ) ) ) but ) ( we ( thought ( it ( was ( very interesting ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP We)) (VP (VBD had) (S (VP (TO to) (VP (VB read) (NP (DT the) (NN book))))))) (CC but) (S (NP (PRP we)) (VP (VBD thought) (SBAR (S (NP (PRP it)) (VP (VBD was) (ADJP (RB very) (JJ interesting))))))) (. .)))