Among infiuential explanations of why preschoolers are so drawn to pretending, Freud's psychoanalytic theory and Piaget's cognitive theory held sway for much of the twentieth century.
( ( Among ( ( infiuential explanations ) ( of ( why ( preschoolers ( ( are so ) ( drawn ( to pretending ) ) ) ) ) ) ) ) ( , ( ( ( ( ( Freud 's ) ( psychoanalytic theory ) ) and ) ( ( Piaget 's ) ( cognitive theory ) ) ) ( ( ( held sway ) ( for ( much ( of ( the ( twentieth century ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Among) (NP (NP (JJ infiuential) (NNS explanations)) (PP (IN of) (SBAR (WHADVP (WRB why)) (S (NP (NNS preschoolers)) (VP (VBP are) (ADVP (RB so)) (VP (VBN drawn) (PP (TO to) (NP (NN pretending)))))))))) (, ,) (NP (NP (NP (NNP Freud) (POS 's)) (JJ psychoanalytic) (NN theory)) (CC and) (NP (NP (NNP Piaget) (POS 's)) (JJ cognitive) (NN theory))) (VP (VBD held) (NP (NN sway)) (PP (IN for) (NP (NP (RB much)) (PP (IN of) (NP (DT the) (JJ twentieth) (NN century)))))) (. .)))
Freud's psychoanalytic theory and Piaget's cognitive theory explains why preschoolers like to pretend.
( ( ( ( ( Freud 's ) ( psychoanalytic theory ) ) and ) ( ( Piaget 's ) ( cognitive theory ) ) ) ( ( explains ( why ( preschoolers ( like ( to pretend ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Freud) (POS 's)) (JJ psychoanalytic) (NN theory)) (CC and) (NP (NP (NNP Piaget) (POS 's)) (JJ cognitive) (NN theory))) (VP (VBZ explains) (SBAR (WHADVP (WRB why)) (S (NP (NNS preschoolers)) (VP (VBP like) (S (VP (TO to) (VP (VB pretend)))))))) (. .)))