Table 5: 
Linguistic phenomena in CoQA questions.
PhenomenonExamplePercentage
Relationship between a question and its passage 
Lexical match Q: Who had to rescue her? 29.8% 
 A: the coast guard 
 R: Outen was rescued by the coast guard 
Paraphrasing Q: Did the wild dog approach43.0% 
 A: Yes 
 R: he drew cautiously closer 
Pragmatics Q: Is Joey a male or female? 27.2% 
 A: Male 
 R: it looked like a stick man so she kept him. She named her new noodle friend Joey 
Relationship between a question and its conversation history 
No coref. Q: What is IFL? 30.5% 
Explicit coref. Q: Who had Bashti forgotten? 49.7% 
 A: the puppy 
 Q: What was his name? 
Implicit coref. Q: When will Sirisena be sworn in? 19.8% 
 A: 6 p.m local time 
 Q: Where 
PhenomenonExamplePercentage
Relationship between a question and its passage 
Lexical match Q: Who had to rescue her? 29.8% 
 A: the coast guard 
 R: Outen was rescued by the coast guard 
Paraphrasing Q: Did the wild dog approach43.0% 
 A: Yes 
 R: he drew cautiously closer 
Pragmatics Q: Is Joey a male or female? 27.2% 
 A: Male 
 R: it looked like a stick man so she kept him. She named her new noodle friend Joey 
Relationship between a question and its conversation history 
No coref. Q: What is IFL? 30.5% 
Explicit coref. Q: Who had Bashti forgotten? 49.7% 
 A: the puppy 
 Q: What was his name? 
Implicit coref. Q: When will Sirisena be sworn in? 19.8% 
 A: 6 p.m local time 
 Q: Where 
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