You shouldn't copy your friend's paper.
Jane and Mary are working on their homework together after school, and Jane is very tired.
Jane wants to finish her paper.
Jane drinks a huge cup of coffee and focuses all her energy on writing the paper based on her class notes.
Jane gets Mary's permission to copy her paper so that she can go to bed early.
Jane gets outstanding marks on her paper and gets it published on the school website.
Jane gets detention because the teacher notices the similarities in Jane and Mary's papers.