I am glad/pleased/delighted/happy/sorry to hear/learn/ tell you that....I am writing to thank you for your help during my stay in America.

I would like to offer some information about/ advice/ suggestions on how to....

I am wondering if you could....我想知道你是否能

Hearing/ learning/ knowing that ...., I am writing to express my sincere thanks/gratitude to you for your warm help/guidance on behalf of my class.

过渡句：

Here is some advice/information.

Here is a brief 简洁的/detailed 详细的schedule/are the details about this activity.

Here are some tips/suggestions for you.

The details/reasons are as follows.

过渡词：

To begin with, / First and foremost, 首要的是

In addition, / Additionally,

What’s more, / Moreover, / Furthermore,此外；另外

More/ Most importantly, / What’s more important is that....

It’s worth mentioning that....值得一提的是....

For example,/ ....such as+n./动词ing

For one thing,/ For another,.....一方面...另一方面表并列

On the one hand,/ On the other hand,...一方面...（但）另一方面表对比

First , Later,/ After that,/ And then,/

In the meanwhile, 同时/ At the same time,...

In conclusion,/ All in all,/ In a word,/ In brief,简言之/ To sum up,....

I sincerely真诚地 hope that....

I firmly/ strongly believe that....我坚信

I hold/ have a firm/ strong belief that....我坚信

It is my belief/promise/hope that....

I am convinced that....我坚信

I am sure that ....

I have confidence that..../ I am confident that

I would be gratefulif you could accept my invitation.

I would appreciate it if you could take my suggestions/application申请into consideration.

We would feel grateful/honored/ pleased if you could spare抽空 some time to come over到访.

Please let me know your decision as soon as possible if it is convenient for you.

Looking forward to your coming/arrival到/hearing from you收到你的来信/your early reply.