1、I was glad to hear you good news.非常高兴听见您的信息。

2、Forgive me for not writing sooner.谅解我没有迅速复书。

3、It was very kind of you to reply so quickly.你可以迅速复书太好了。

4、I am sorry to hear that you have not been well.听说您身体不好我很难过。

5、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。