模板句型：
开头句：说明邀请目的
On behalf of…, I have the honor to invite you to…
It is with the great pleasure that I write to cordially invite you to…
结尾句：期盼回复
I do hope that you will be able to come.
We should be very pleased if you could honor us with your company.
推荐信
模板句型：
开头句：说明写作目的
I am writing to you to recommend … for …
I take great pleasure in recommending to you … as …
I would like to present … for your consideration in your search for …
With reference to your requirements, I shall, without reservation, recommend … as an ideal candidate.
结尾句：总结说明
I am confident/ convinced that …
I strongly recommend him to you with no reservation.
Therefore, I do not hesitate to recommend her as an ideal candidate for the post you advertised.