What's your first name?

你的名字叫什么？

I'm writing to a friend of mine in South American.

我在写信给一个美国南部的朋友。

One of my suitcases is small,and the other one is medium size.

我的一个提包是小的，另一个是中等的尺寸。

I hope you'll be well soon.

我希望你不久将好。

After you think it over,please let me know what you decide.

在你考虑它以后，请让我知道你决定什么。

They had to call in a heart specialist.

他不得不请一位心脏病专家。