Answers.Body: <p>This seems not easy for NLP. I doubt that state-of-the-art NLP tools can reliably determine the correct hierarchical structure of independent clauses. Examples below.</p>
  
  <p>The <a href="http://tomato.banatao.berkeley.edu:8080/parser/parser.html" rel="nofollow noreferrer">Berkeley parser</a> gets it basically right in the sense that it can put <code>its late</code> and <code>I'm tired</code> on parallel, and they together on parallel with <code>the weekend</code>. But still not perfect (<code>the weekend</code> should be in the same subtree with <code>It's</code> rather than <code>if its late and I'm tired</code>)</p>
  
  <p><a href="https://i.sstatic.net/u7Dct.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/u7Dct.png" alt="enter image description here"></a></p>
  
  <p>The <a href="http://nlp.stanford.edu:8080/parser/index.jsp" rel="nofollow noreferrer">Stanford parser</a>, which is available in Python (NLTK), incorrectly parsed <code>I\'m tired</code> to the same level of <code>I drink orange juice</code>.</p>
  
  <p><a href="https://i.sstatic.net/jQZ9c.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/jQZ9c.png" alt="enter image description here"></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-04-11T08:19:29.217Z
Answers.Text: The question and answer both ignore that "its" is a PRP$ (possessive pronoun), while "it's" is required for a  legitimate parse.
Answers.UserDisplayName: amI
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-10T16:40:45.947Z
Answers.Text: Would you mind sharing your grammar rule for `nltk.RegexpParser()`? I'm still trying to wrap my head around that.
Answers.UserDisplayName: tim_xyz
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Answers.CreationDate: 2018-09-10T17:31:49.407Z
Answers.Text: I didn't use `RegexpParser()`.
Answers.UserDisplayName: user12075
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Answers.UserDisplayName: user12075
Body: <p>Is there an accepted way in NLP to parse conjunctions (and/or) in a sentence?</p>
  
  <p>By following the example below, how would I parse</p>
  
  <blockquote>
    <p>I drink orange juice if its the weekend or if it's late and I'm tired.</p>
  </blockquote>
  
  <p>into</p>
  
  <blockquote>
    <p>it's the weekend</p>
  </blockquote>
  
  <p>and </p>
  
  <blockquote>
    <p>it's late</p>
  </blockquote>
  
  <p>and </p>
  
  <blockquote>
    <p>I'm tired</p>
  </blockquote>
  
  <p>?</p>
  
  <p>Implying an action will be taken when one of the above elements at the 1st level of depth is true.</p>
  
  <p>I know when I hear the sentence that it means "its the weekend" OR ("it's late" AND "I'm tired"), but how could this be determined computationally?</p>
  
  <p>Can an existing python/other library do this?</p>
  
Tags: <natural-language-processing><python><computational-linguistics>
Title: How to parse conjunctions in natural language processing?
UserDisplayName: tim_xyz
ThreadText: # How to parse conjunctions in natural language processing?
  
  (Asked by: username_0 on 2018-09-07)
  
  Is there an accepted way in NLP to parse conjunctions (and/or) in a sentence?
  
  By following the example below, how would I parse
  
  > I drink orange juice if its the weekend or if it's late and I'm tired.
  
  into
  
  > it's the weekend
  
  and
  
  > it's late
  
  and
  
  > I'm tired
  
  ?
  
  Implying an action will be taken when one of the above elements at the 1st level of depth is true.
  
  I know when I hear the sentence that it means "its the weekend" OR ("it's late" AND "I'm tired"), but how could this be determined computationally?
  
  Can an existing python/other library do this?
  
  **Tags:** natural-language-processing, python, computational-linguistics
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-09-08. Score: 1 | Accepted answer
  
  This seems not easy for NLP. I doubt that state-of-the-art NLP tools can reliably determine the correct hierarchical structure of independent clauses. Examples below.
  
  The [Berkeley parser](http://tomato.banatao.berkeley.edu:8080/parser/parser.html) gets it basically right in the sense that it can put `its late` and `I'm tired` on parallel, and they together on parallel with `the weekend`. But still not perfect (`the weekend` should be in the same subtree with `It's` rather than `if its late and I'm tired`)
  
  [![enter image description here](https://i.sstatic.net/u7Dct.png)](https://i.sstatic.net/u7Dct.png)
  
  The [Stanford parser](http://nlp.stanford.edu:8080/parser/index.jsp), which is available in Python (NLTK), incorrectly parsed `I\'m tired` to the same level of `I drink orange juice`.
  
  [![enter image description here](https://i.sstatic.net/jQZ9c.png)](https://i.sstatic.net/jQZ9c.png)
  
  > **Comments:**
  > **username_0**: Would you mind sharing your grammar rule for `nltk.RegexpParser()`? I'm still trying to wrap my head around that.  
  > **username_1**: I didn't use `RegexpParser()`.  
  > **username_2**: The question and answer both ignore that "its" is a PRP$ (possessive pronoun), while "it's" is required for a  legitimate parse.  
  
  ---
  
  