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.

Sentence: John couldn't see the stage with Billy in front of him because he is so tall.
 Question: Why does the 'he' refer to billy?
Because Billy in front of him because he is so talJohn couldn't see the stage.

Sentence: I'm sure that my map will show this building; it is very good.
 Question: Why does the 'it' refer to the map?
Because they are talking about how the are sure the map will work.

Sentence: Bob collapsed on the sidewalk. Soon he saw Carl coming to help. He was very ill.
 Question: Why does the 'He' refer to bob?

Because Bob collapsed so he would be the one who was ill.