I am writing to formally request to …

We shall be greatly obliged if you …

May I ask you to consider …

Could you be kind enough to …

I am writing to seek your assistance in …?

I am writing to request you to make an investigation on the matter of …

Will you be so kind enough to give me some information about …

Would you be kind enough as to…?

I would very much like to ask for your permission with this letter to…?

结尾常用句式

I am looking forward to hearing from you.

Thank you for your kind assistance.

I shall greatly appreciate your answering my questions.

I would like to thank you for your generous help in this case.

I should remain grateful to you for the great help…

I would appreciate your considering this matter and getting back to me at your earliest convenience.

I do appreciate the favorable consideration you have shown to me.

Thank you for your attention to these requests.

其他常用句式

I’d like to suggest that…

May I suggest that …

In my opinion …

I would like to make a recommendation that…

I am writing to advise you of…

If I were you, I would…

Could you possibly…?

Is there any possibility of…?

The reasons for … is that…

If you have questions, please feel free to contact me at…