use*_*733 14 parsing parse-tree stanford-nlp
我想知道SBAR是什么意思,我如何正确地在树中表示这句话？
为什么有2个S？
原句是: After she ate the cake, Emma visited Tony in his room.
(ROOT
(S
(SBAR (IN After)
(S
(NP (PRP she))
(VP (VBD ate)
(NP (DT the) (NN cake)))))
(, ,)
(NP (NNP Emma))
(VP (VBD visited)
(NP
(NP (NNP Tony))
(PP (IN in)
(NP (PRP$ his) (NN room)))))
(. .)))