陈情
Does the need to know our situation overwhelm you?
邀请
Undoubtedly, an enthusiast for reading like you will be more than excited.
I’m writing to you to sign up with me together.
Knowing you’re an enthusiast for~/a lover of~, I’m writing to~
Looking forward to your active participation~
欢迎/日程
I’m writing to extend my warmest welcome to you and confirm our schedule on the day you arrive.
be to head directly to my home
_are also scheduled so that you can get a deeper insight into~
(表达期望）it is my hope that~
it will lay a solid foundation for further~
I’m convinced that it will be a treasured memory
_will be enchanted by our beautiful city
建议
开头：to help you out
pleased to know your passion for~
In response to your inquiry, I’d like to~
it is indeed a wonderful idea and hopefully, it will be a success
引出建议：it will offer us a chance to~
it would be best to~
it is advisable to give a chance to sth.
after all，_calls for~
请求
I hope it can meet these requirements
please inform me of
so would you be so kind to~
give me some recommendations on~
回绝
I do appreciate it but I’m afraid I cannot afford it.
理由：So important are they that I have to get myself well prepared for them, making full use of the summer vacation
自荐
I found this position quite appealing and I’m well qualified for the job.
Glad to learn that ~ is around/approaching/on the way/drawing near/drawing close, I’m writing to recommend myself for this precious opportunity.
理由：I have a good grasp of English, which greatly helps to facilitate communication.
Besides, once being a ~ in a ~, I have the experience of how to be a good ~ (比如host，主持人），like how to ~ (feel ease on the stage and interact with the audience.)
my skills suit me to the job
祝贺
Congratulations on your officially becoming a member of our club.
Hope you will find it fun with us!
介绍推荐
- 开头
  ~ be scheduled to run from ~ to ~
  ~ falls in the lecture hall this week, brightening our school life
- 内容
  deeply impressed by ~
  I totally immersed myself in the charm of ~
  a platform to display ~
  tailored specially to students, sth covered diverse activities, ranging from ~ to ~
  Not did it help us ~ , but also ~
  What was the most impressive was ~
  I highly recommend a visit to ~
  ~ is the very experience that you cannot miss
- 结尾
  Reserve your ticket in advance if you are interested in ~ !

(未完待续）