Gradually, the child takes increasing responsibility for attaining intersubjectivity, until both parties make similar contributions to the shared mental state that fuels children's learning in the  zone. 
( Gradually ( , ( ( the child ) ( ( ( ( takes ( ( increasing responsibility ) ( for ( attaining intersubjectivity ) ) ) ) , ) ( until ( ( both parties ) ( ( ( make ( similar contributions ) ) ( to ( the ( shared ( mental state ) ) ) ) ) ( that ( ( fuels children ) ( 's ( learning ( in ( the zone ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Gradually)) (, ,) (NP (DT the) (NN child)) (VP (VBZ takes) (NP (NP (VBG increasing) (NN responsibility)) (PP (IN for) (S (VP (VBG attaining) (ADVP (RB intersubjectivity)))))) (, ,) (SBAR (IN until) (S (NP (DT both) (NNS parties)) (VP (VBP make) (NP (JJ similar) (NNS contributions)) (PP (TO to) (NP (DT the) (JJ shared) (JJ mental) (NN state))) (SBAR (IN that) (S (NP (NNS fuels) (NNS children)) (VP (VBZ 's) (VP (VBG learning) (PP (IN in) (NP (DT the) (NN zone))))))))))) (. .)))
The child is expected to eventually take more responsibility.
( ( The child ) ( ( is ( expected ( to ( eventually ( take ( more responsibility ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN child)) (VP (VBZ is) (VP (VBN expected) (S (VP (TO to) (VP (ADVP (RB eventually)) (VB take) (NP (JJR more) (NN responsibility))))))) (. .)))