instruction:
In this task you need to give reasons to justify the pronoun coreference relations. Each of the provided inputs contains a sentence with a target pronoun and a question about how to justify the coreference between a noun phrase and the target pronoun. Good practices involve the discussion about how the descriptions attached to the targeted pronoun relate to the noun phrase candidate in the question. The reasoning could come from one or multiple following knowledge types about commonsense: First: 'Property', the knowledge about property of objects (e.g., ice is cold). Second: 'Object', the knowledge about objects (e.g., cats have ears). Third: 'Eventuality', the knowledge about eventuality (e.g., 'wake up' happens before 'open eyes'). Forth: 'Spatial', the knowledge about spatial position (e.g., object at the back can be blocked). Fifth: 'Quantity', the knowledge about numbers (e.g., 2 is smaller than 10). Sixth: all other knowledge if above ones are not suitable. Write the sentence in natural language.
question:
Sentence: John promised Bill to leave, so an hour later he left.
 Question: Why does the 'he' refer to john?
answer:
Because the whole sentence is about the action of john.


question:
Sentence: I stuck a pin through a carrot. When I pulled the pin out, it left a hole.
 Question: Why does the 'it' refer to the pin?
answer:
Because a carrot cannot leave a hole in itself.


question:
Sentence: The scientists are studying three species of fish that have recently been found living in the Indian Ocean. They began two years ago.
 Question: Why does the 'They' refer to the scientists?
answer:

Because The fish were being studied; the scientists were doing the studying which would have began two years ago.


