Brother forgive me please~!

Hi! brother I'm Kelly
> No need to add this sentence. He is your brother so he knows who you are. :)

Can you forgive me? Because I punch your stomach. 
 Please forgive me for punching your stomach.

So you cry. I'm very very sorry. Please Can you forgive me? I very sorry!
> I know it hurts because you cried. I am very sorry.

* Let's make it simple and clear.
* Avoid repeating the same word in your sentence.

Hello Kelly! Thank you for sending me your homework. I really appreciate your effort. Keep practice and always have time to study your corrections. See you in class. Take care always. ^^