Infants tried all manner of signals'facial expressions, vocalizations, and body movements'to get their mother or father to respond again.
( Infants ( ( tried ( ( ( all manner ) ( of ( ( ( ( ( ( ( signals ` ) ( facial expressions ) ) , ) vocalizations ) , ) and ) ( body movements ) ) ) ) ( ` ( to ( ( get ( their ( ( mother or ) father ) ) ) ( to ( respond again ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Infants)) (VP (VBD tried) (S (NP (NP (DT all) (NN manner)) (PP (IN of) (NP (NP (NNS signals)) (`` `) (NP (JJ facial) (NNS expressions)) (, ,) (NP (NNS vocalizations)) (, ,) (CC and) (NP (NN body) (NNS movements))))) (`` `) (VP (TO to) (VP (VB get) (NP (PRP$ their) (NN mother) (CC or) (NN father)) (S (VP (TO to) (VP (VB respond) (ADVP (RB again))))))))) (. .)))
Infants do not attempt to signal their parents at all.
( Infants ( ( ( do not ) ( attempt ( to ( ( signal ( their parents ) ) ( at all ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Infants)) (VP (VBP do) (RB not) (VP (VB attempt) (S (VP (TO to) (VP (VB signal) (NP (PRP$ their) (NNS parents)) (ADVP (IN at) (DT all))))))) (. .)))