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: Sam took French classes from Adam, because he was eager to speak it fluently.
 Question: Why does the 'he' refer to sam?
[A]: Because the person teaching the class should already be fluent.


[Q]: Sentence: I couldn't find a spoon, so I tried using a pen to stir my  coffee. But that turned out to be a bad idea, because it got full of coffee.
 Question: Why does the 'it' refer to the pen?
[A]: Because The coffee is already full, so you assume its the pen.


[Q]: Sentence: Joe's uncle can still beat him at tennis, even though he is 30 years older.
 Question: Why does the 'he' refer to joe's uncle?
[A]:
Because to beat someone implies superior physical ability, and being older would normally make the younger one more likely to win.