code: def _get_tree(self):
      if self.parse_corpus is None:
          return None
      if self.fileid not in self.parse_corpus.fileids():
          return None
      return self.parse_corpus.parsed_sents(self.fileid)[self.sentnum]
  
imports: import re
  from functools import total_ordering
  from xml.etree import ElementTree
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.util import *
  from nltk.internals import raise_unorderable_types
  from nltk.tree import Tree
label_desc: Use image node_id 7 for calling the PropbankInstance obj's underlying member method code with example usage: obj._get_tree() and returns: self, None, None