从 Penn Treebank 格式的文本中提取子句
假设我有一句话：
After he had eaten the cheese, Bill went to the grocery.
在我的程序中，我得到以下输出：
---PARSE TREE---
(ROOT
(S
(SBAR (IN After)
(S
(NP (PRP he))
(VP (VBD had)
(VP (VBN eaten)
(NP (DT the) (NN cheese))))))
(, ,)
(NP (NNP Bill))
(VP (VBD went)
(PP (TO to)
(NP (DT the) (NN grocery))))
(. .)))
如何将不在子句内的内容合并为独立子句？像这样：
S Clause {
SBAR Clause {
After he had eaten the cheese,
}
S Clause {
Bill went to the grocery.
}
}
我很确定我不清楚，但基本上我想提取句子的独立子句和从属子句，以及这些子句的子句。
Say I have a sentence:
After he had eaten the cheese, Bill went to the grocery.
In my program, I get the following output:
---PARSE TREE---
(ROOT
(S
(SBAR (IN After)
(S
(NP (PRP he))
(VP (VBD had)
(VP (VBN eaten)
(NP (DT the) (NN cheese))))))
(, ,)
(NP (NNP Bill))
(VP (VBD went)
(PP (TO to)
(NP (DT the) (NN grocery))))
(. .)))
How would I merge the stuff not within a clause to become an independent clause? Like this:
S Clause {
SBAR Clause {
After he had eaten the cheese,
}
S Clause {
Bill went to the grocery.
}
}
I'm pretty sure that I'm not clear, but basically I want to extract the independent and dependent clauses of the sentence, and the subclauses of those clauses.
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这是 NLTK 指南中的演示代码（它没有明确显示如何提取子句）：
http://nltk.googlecode.com/svn/trunk/doc/howto /tree.html
Here is a demonstration code from the NLTK guide (It doesn't explicitly show how to extract a clause):
http://nltk.googlecode.com/svn/trunk/doc/howto/tree.html