I think you are right,because coping is dishonest.Peter said he didn't understand the homework,and he wanted to copy your homework.If you do that,Peter and his parents will be happy .But Peter will learn nothing.And he won't improve.If you want to help him,you should spend time telling him how to answer the question,and explaining the problem to him.And you should talk with him and tell him that he should work harder.
有的句子句意还有点不对头,但改后的这篇没什么语法问题了