( ( ( ( ( Adult birds ) ( prefer ( to ( ( eat acorns ) ( in season ) ) ) ) ) ; ) ( ( at ( other times ) ) ( they ( eat ( ( the seeds ) ( of ( ( ( ( ( ( ( trees , ) mulberries ) , ) ( duckweed ( , ( wild rice ) ) ) ) , ) and ) ( wild grapes ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Adult) (NNS birds)) (VP (VBP prefer) (S (VP (TO to) (VP (VB eat) (NP (NNS acorns)) (PP (IN in) (NP (NN season)))))))) (: ;) (S (PP (IN at) (NP (JJ other) (NNS times))) (NP (PRP they)) (VP (VBP eat) (NP (NP (DT the) (NNS seeds)) (PP (IN of) (NP (NP (NNS trees)) (, ,) (NP (NNS mulberries)) (, ,) (NP (JJ duckweed) (, ,) (JJ wild) (NN rice)) (, ,) (CC and) (NP (JJ wild) (NNS grapes))))))) (. .)))
Adult birds prefer to eat acorns in season; at other times they eat the seeds of trees, mulberries, duckweed, wild rice, and wild grapes.
(ROOT (S (NP (NP (DT An) (NN acorn)) (VP (VBG growing) (PP (IN into) (NP (DT an) (JJ adult) (NN tree))))) (VP (MD will) (VP (VB take) (NP (DT the) (JJS longest) (NN time)) (S (VP (TO to) (VP (VB observe)))))) (. .)))