They had built a lean-to for a shelter,
 
        
             
        
        
        
Omg the points is what i need
        
                    
             
        
        
        
Indefinite pronouns are used to refer to nonspecific people, things or places. In this way, the speaker uses -body or -one to refer to people, and    -thing to indicate objects. As a general rule, these pronouns are consider to be in the singular form so the verb has to agree with it.  
It is important to highlight that “Nothing” is used in negative sentences (example: Nobody worked yesterday.)
"Something" is used for unknown or nonspecific object and it is appears in affirmative sentences.(Example: I saw something in the kitchen).
“Everything” is used to refer to a total amount of nonspecific objects and it appears in affirmative sentences.(Example: I bought everything yesterday).
 
        
             
        
        
        
It's a use of literary styles and techniques to create factually accurate narritives. I found this on google. 
        
             
        
        
        
Adjectives and Adverb phrases relate to prepositional phrases because if you remember what an adjective is, it describes a noun and then an adverb i believe can describe a verb, adjective, and other adverbs. Both adjective and adverb phrases contain prepositions, there fore relating them to prepositional phrases.... I hope this is what you were looking for and answered your question... :)