I'll miss you. 我会想你的。

I wish I could go with you.我真希望能和你在一起。

Give me a call sometime.有空给我打电话。

Call me sometime. 有空打电话。

Let's get together again sometime. 我们什么时候再聚吧。

Let's keep in touch. 保持联系。

Don't forget to write. 别忘了写信。

Please give my regards to your family. 请代我向你的家人问好。