> literature is difficult. I,m interested reading books. 

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* Correction:     Student's sentence        Corrected sentence        Grammar explanation       Better sentence    

literature is difficult.

Literature is difficult.

Whenever you write, don't forget to capitalize the first letter of your sentence.

Learning literature is difficult.

I,m interested reading books. 

I'm interested in reading books. 

Apostrophe (') is the appropriate punctuation mark in contracted words. 

"Interested in" is used when what comes after it is a noun, or a verb acting like a noun (known as a gerund)