6、I was very happy to receive your letter of October 10th.我很高兴收到你10月10日的来信。

 

7、I’m so sorry for not having written to you for such a long time.十分报歉，很久没有给你写信了。

 

8、I’m sorry I took so long to reply.很报歉给你回信晚了。

 

9、It’s a long time since I got your last letter.我收到你的信已经很长一段时间了。