01普通书信开头I was delighted/glad to receive your letter
很高兴收到你的来信
Your letter came to me this morning
我今天早上收到了你的来信
I have received your letter of June the 29th
我收到了你于 6 月 29 日的来信
How nice to hear from you again
很高兴再次收到你的来信
How is it going
You asked me about(problem,question
),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
It has been a long time since we met
我们很久没见面了
How time flies
It's three months since I saw you last time
时间过得真快
我们有三个月没见面了
I'm writing to thank you for your help during my stay in America
我写信是为了感谢你对我在美国期间的帮助
结尾I am looking forward to receiving your letter
我期待你的来信
Thank you in advance
Please write to me as soon as possible
Good luck
/Wish you the best of luck
With best wishes
致以我诚挚的祝福
Wish you success
Wish you a plea