Looking for a Japanese penfriend for my language classes.

为我的语言班寻找一位日本的笔友。

Penfriend Society has been set up for the purpose of promoting friendship.

建立笔友会是为了促进友谊。

In your last letter, you said that you wanted to have some Chinese penfriend.

你在上次信中要求得到一些中国的笔友英语是什么。