求一封英语道歉信.

这周上外教课，Mr.Robert（我的外教老师，英国来的）让我们讨论的时候，我和我同桌的在手机上玩扑克游戏，结果给他看到了，还没收了我的手机。当然下课我们去道歉，他只把手机还给了我，但拒绝了我们的道歉！
过程就是这样的，现求一封道歉信，希望朋友们帮下忙

Dear Mr Robert,

For our class cellphone that one thing, we feel very sorry. But you refused to our apology, we also embarrassed. Our aim is to write this letter to you forgive. We don't want you to Chinese students have a bad impression. Please forgive us..

Yours,

Students(可以写你和你同学的名字)

Dear Mr.Robert,

I'm very sorry that my friend and I were playing games on the phone when you were teaching English.

I know we should listened to you carefully and answered your questions. Tell me what should I do that you can forgive me. I will do that and I won't do it again.Thank you.

Yours,

Student

Dear Mr Robert,

I'm sorry that we played games when you asked us to discuss. I know it is wrong when I am playing games in class. We should listen to the teachers carefully. I'm so sorry,teacher. I will not do it again. Please accept my excuse.

Thank you.