自我介绍： I am Li Hua, coming from a middle school, which is the best education institution in my beautiful city.
感谢信：I am writing this letter to express my sincere gratitude for your help.
道歉信：I am writing this letter to express my apology for any inconvenience caused.
询问信：I am writing this letter to see if it is possible for you to provide me with some imformation which is very important to me.
建议信：I am writing this letter to make some conductive suggestions.
邀请信：I am writing this letter to invite you to come with us in an important issue.
请求信：I am writing to ask whether you can do me a favor.
What I want to stress in this letter is that ……
Since it is (not)helpful， I suggest you doing sth.
As we all know, ……
It is important to do sth.
It should be a good idea to do sth.
By doing so, you will ……
Here are a few suggestions.
It also helps to do sth.
It is a good opportunity for you to do ……
As for my suggestion, I think it’s better to do sth.
I was delighted to learn that ……
I would like to express my thanks to you for your advice.
Look for = seek = search for;good = perfect = excellent;
very = rather;all kinds of = all sorts of = various;
come up with some ideas;for example = for instance;
of course;what’s more = besides ;
in order to do sth.;by the way;
but = however;otherwise;unless;
though = although;
because = as = since;be eager to do sth.;
be lucky enough to do sth.;more and more;
above all = in a word;
in fact = as a matter of fact;
so = thus = therefore = as a result
I am looking forward to receiving your reply.
If you have any suggestions, please let me know.
Thank you sincerely in advance.
求职信、投诉信、询问信、建议信、邀请信：Thank you for your consideration and I will be looking forward to your reply.
感谢信：I would like to express my thanks for your warm hospitality with a little gift that you will shortly receive.