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.

[EX Q]: Sentence: I used an old rag to clean the knife, and then I put it in the trash.
 Question: Why does the 'it' refer to the rag?
[EX A]: Because The rag was already old, so it makes sense to throw it away.

[EX Q]: Sentence: The sun was covered by a thick cloud all morning, but luckily, by the time the picnic started, it was out.
 Question: Why does the 'it' refer to the sun?
[EX A]: Because the sun is the thing being covered, so "it" is out when it is no longer covered. The cloud can't cover itself.

[EX Q]: Sentence: The sack of potatoes had been placed above the bag of flour, so it had to be moved first.
 Question: Why does the 'it' refer to the sack of potatoes?
[EX A]:
Because Its on top.

