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: Tom threw his schoolbag down to Ray after he reached the bottom of the stairs.
 Question: Why does the 'he' refer to ray?
answer:
Because Tom threw his bag down, meaning he was at the top. Ray had to be at the bottom.


question:
Sentence: We had hoped to place copies of our newsletter on all the chairs in the auditorium, but there were simply not enough of them .
 Question: Why does the 'them' refer to copies of the newsletter?
answer:
Because chairs has fixed amount.


question:
Sentence: The police arrested all of the gang members. They were trying to run the drug trade in the neighborhood.
 Question: Why does the 'They' refer to the gang members?
answer:

Because gangsters run drug trade.


