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: Sam broke both his ankles and he's walking with crutches. But a month or so from now they should be unnecessary.
 Question: Why does the 'they' refer to the crutches?
[EX A]: Because The crutches are likely to not be neceserry to him a month from now that he's healed up as oppose to his ankles.

[EX Q]: Sentence: I poured water from the bottle into the cup until it was full.
 Question: Why does the 'it' refer to the cup?
[EX A]: Because cup gets water. So it gets full.

[EX Q]: Sentence: Billy cried because Toby wouldn't share his toy.
 Question: Why does the 'his' refer to toby?
[EX A]:
Because You assume Billy is crying because Toby won't share.