I would very much like to be your penfriend .

我非常愿意成为你的笔友。

I 'd like to be your penfriend .

我想成为你的笔友。

Helen wants to find a penfriend .

海轮想要找一个笔友。

What would you like to know about your penfriend ?

你想了解笔友的什么情况？

I haven 't corresponded with my penfriend smith for a long time .

我好长时间没有和笔友史密斯通信了。