def test_pluralize_past_verb_3(self):
     assert pluralize_single_verb(self.doc_10[2]) is None
 def test_pluralize_present_verb_3(self):
     assert pluralize_single_verb(self.doc_7[2]) == 'try'
 def test_pluralize_past_verb_2(self):
     assert pluralize_single_verb(self.doc_9[1]) is None
 def test_pluralize_present_verb_2(self):
     assert pluralize_single_verb(self.doc_6[1]) == 'teach'
 def test_pluralize_present_verb_1(self):
     assert pluralize_single_verb(self.doc_5[1]) == 'walk'
 def test_pluralize_was_4(self):
     assert pluralize_single_verb(self.doc_4[1]) == 'were'
 def test_pluralize_was_3(self):
     assert pluralize_single_verb(self.doc_3[4]) == 'were'
 def test_pluralize_was_2(self):
     assert pluralize_single_verb(self.doc_2[0]) == 'Were'