1、How is it going? 最近怎么样?

2.I am glad to receive your letter.很高兴收到你的来信.

3.You asked me about(+problem question 等）,now let me give you some advice.你在来信中询问我.,现在,让我给你一些建议.

4.It has been a long time since we met.我们很久没见面了