要写出好的书面表达，对各种文体的熟悉是不可缺少的，书信是《PETS-2级考试大纲》规定的文体书信。
在写信时注意以下几点： a．地址要由小到大。 b．朋友间的信函无需加上写信人地址和收信人地址。 c．称呼语用Dear+姓(正式)，Dear+名(朋友间)。非常随便的信件可直呼其名，
D.书信的开头常见句型如下：
Your letter came to me this morning.
I have received your letter of July the 20th.
I’m writing to you about the lecture to be given next Monday.
I’m writing to ask if you can come next week.
How time flies! It’s three months since I saw you…
Thank you for your letter.
In reply to your letter about (the exhibition this year)…;
Let me tell you that… / I am very glad to hear from you.
Thank you for your letter.
E.结尾语或结束语常见句型如下:
Please remember me to your whole family.
Give my best regards (wishes) to your mother.
Best wishes. /With love.
Wish you a pleasant journey.
Wish you success. Wish you the best of health. (luck)
Looking forward to your next visit to China.
Looking forward to the pleasure of meeting you.
Expecting to hear from you as soon as possible
I hope to have a letter from you before long.
Please write to me soon and tell me all about yourself.
Give my best wishes to you.
Wishing your business ever successful！Hope you are healthy.
F.落款分正式与非正式两种：
Yours sincerely, Yours faithfully,
正式
或Sincerely yours, Faithfully yours.
Love,
非正式，朋友间等。
Yours ever,
……
英文信函按其功用不同又可分为:邀请信，对邀请信的复信，感谢信，介绍信，求职信等等，下面分别举例说明。
(1)邀请信
写邀请信要用上一些发出邀请的短语和句型：
Can／Could you come to...?
We would be very happy if you could join us.
It would be very nice to see you here with us.
典型例文：
Dear Professor Wang,
On behalf of the Ohio State University and the IEEE Computer Society, I would be very pleased to invite you to attend 2004 International Conference on Computer Science to be held in Bellaire, Michigan, from October 25 to October 28, 2004.
We sincerely hope that you could accept our invitation. If you can come, please let us know as soon as possible, since we have to prepare the final program soon. We are looking forward to your acceptance.
Sincerely yours,
Peter White
(2)复信
在接到邀请后，可以回信接受或拒绝。不管是否接受，都要先表示感谢邀请。若接受，应表明自己很高兴参加该项活动；若拒绝，要婉转地拒绝并写出拒绝原因。最后还要祝愿活动成功。
在拒绝邀请时要使用婉转的语言，可用下列表达方式：
