Here we are. $8.50, please.

我们到了。请付8。5美元。

Take care of yourself and don't forget to keep in touch.

多多保重。别忘了保持联系。

We're having some friends over. What are you doing?

我们打算请几位朋友来玩。你打算干什么呢？

Yes.

是的。

It's no trouble at all. I'll carry this suitcase for you.

一点也不麻烦，我来替你提这只箱子。

I believe so.

我相信是这样。