Indeed, no clear dividing line exists between prereading and reading.
( Indeed ( , ( ( no ( clear ( dividing line ) ) ) ( ( exists ( between ( ( prereading and ) reading ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Indeed)) (, ,) (NP (DT no) (JJ clear) (NN dividing) (NN line)) (VP (VBZ exists) (PP (IN between) (S (VP (VBG prereading) (CC and) (VBG reading))))) (. .)))
It is easy to tell the difference between prereading and reading.
( It ( ( is ( easy ( to ( tell ( ( the difference ) ( between ( ( prereading and ) reading ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ easy) (S (VP (TO to) (VP (VB tell) (NP (NP (DT the) (NN difference)) (PP (IN between) (NP (VBG prereading) (CC and) (VBG reading))))))))) (. .)))