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.

[Q]: Sentence: Thomson visited Cooper's grave in 1765. At that date he had been travelling for five years.
 Question: Why does the 'he' refer to thomson?
[A]: Because Cooper was in the grave and therefore couldn't be travelling.


[Q]: Sentence: I took the water bottle out of the backpack so that it would be handy.
 Question: Why does the 'it' refer to the water bottle?
[A]: Because Is was taken out of the backpack.


[Q]: Sentence: They broadcast an announcement, but a subway came into the  station and I couldn't hear over it .
 Question: Why does the 'it' refer to the subway?
[A]:
Because it is hard to hear over a noise generator.


