How nice to hear from you again.
很高兴再次收到你的回信
Let me tell you something about the activity.
让我告诉你一些关于这次活动的细节
I‘m glad to have received your letter of Apr. 9th.[/color]
很高兴收到你在4月9号的来信
I‘m pleased to hear that you’re coming to China for a visit.
很高兴得知你将来拜访中国
I‘m writing to thank you for your help during my stay in America.
我正写这封信感谢我在美国你对我的帮助
自荐信:Now, I am writing to apply for the job/position.
感谢信:Now, I am writing to show/ express my heartfelt gratitude to you.
邀请信:Now, I am writing to invite you to join/enjoy/suffer/experience the....(as our guest/ judge/ instructor).
建议信:Now, I am writing to give you a hand.
求助信:Now, I am writing to ask you to give me a hand/ do me a favor.
道歉信:Now, I am writing to show/ express my heartfelt apology to you.
告知信:Now, I am writing to tell you about the details.