英语书信作文的开头和结尾有一些常用的万能句型，可以帮助你更流畅地表达。以下是一些常见的开头和结尾句型：

开头句型

Dear [Recipient's Name],

亲爱的[收件人姓名],

Hello,

你好,

Hi [Recipient's Name],

嗨，[收件人姓名],

How is it going？

最近怎么样？

I am glad to receive your letter.

我很高兴收到你的来信.

You asked me about （+problem question etc.）, 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 nice to hear from you again.

很高兴再次收到你的回信.

I have just this moment received your letter and I am writing at once because...

我此时收到你的来信，便立即写信，因为...

Your letter of... was duly received.

你……的来函已妥收.

结尾句型

I am looking forward to receiving your letter.

我期待着你的来信.

Thank you in advance.

提前谢谢你.

Please write to me as soon as possible.

请尽快回信.

Good luck | Best wishes.

祝你好运.

Just as an old saying goes, [插入谚语或常用语].

正如一句古老的谚语所说，

However...

不过就是...,

From my point of view, [插入你的观点].

从我的立场来说，

From what has been discussed above, we may safely draw the conclusion that...

通过以上讨论，我们可以得出结论...,

Take care of yourself, will you？

保重，好吗？

Send my love to your [family member or friend].

向你的[家人或朋友]问好.

Please write to me when you have time.

有空时请给我写信.

Please write soon.

请尽快写信.

Let’s keep in touch.

让我们保持联系.

这些句型可以根据你的具体需求进行选择和调整，使你的书信更加自然和得体。希望这些信息对你有所帮助!