TASK DEFINITION: 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.
PROBLEM: Sentence: Mark told Pete many lies about himself, which Pete included in his book. He should have been more  truthful.
 Question: Why does the 'He' refer to mark?

SOLUTION: Because Mark was the one lying. Not Pete. So Mark should have been truthful.

PROBLEM: Sentence: The customer walked into the bank and stabbed one of the tellers. He was immediately taken to the police station.
 Question: Why does the 'He' refer to the customer?

SOLUTION: Because the stabber would go to the police station.

PROBLEM: Sentence: The sun was covered by a thick cloud all morning, but luckily, by the time the picnic started, it was gone.
 Question: Why does the 'it' refer to the cloud?

SOLUTION:
Because A thick cloud was covered  the sun at every morning.