It is so great to hear from you again.
It is a great pleasure for me to …
With great delight I learned that …
I must apologize for not writing to you sooner.
建议：
In my experience, it seems that _______ would make sense in your situation
In my opinion, it would be wise for you to take the following actions:
感谢：
I truly appreciate your kindness.
Thank you from the bottom of my heart for...
道歉：
I apologize most sincerely for...
I am so sorry to have put you through so much trouble...
邀请：
We would be honored to have you there with us...
I will cover all the expense involved.
抱怨：
I very much regret to have to inform you that...
We will appreciate your willingness to make up for the loss
I hope that the above situation will be improved as soon as possible
咨询：
I would like to request some information about...
Should I need to send further materials, please let me know.
求职：
In anwser to your advertisement I wish to apply for a post as … in your office.
I hope I may be granted an interview…
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