Invitation

The honor of your presence is requested...

若你能出席________，我（们）将感到万分荣幸。

It's a pleasure for me to invite you to...

我很荣幸地邀请你参加__________。

We sincerely hope that you make it.

我们真诚地希望你能参加。

We would be honored to have you there with us...

如果您能参加我们的__________，我们将不甚荣幸。

I will cover all the expense involved.

我将负担所有的费用。

Sympathy

I can only imagine how difficult this time must be for you, and I want to extend to you my unwavering support.

我能想象你所经历的一切，而且，我想告诉你，我会永远支持你。

Complain

I am writing to express my dissatisfaction with/at...

我写这封信是想告诉你们我对________不是很满意。

I very much regret to have to inform you that...

很遗憾地通知你，__________。

I would like to draw the attention of the authorities concerned to the ...

我想就_____________问题引起有关部门的重视。

I feel something ought to be done about...

我觉得________方面还可以作一些努力（需要改进）。

I hope that the above situation will be improved as soon as possible.

我希望以上问题（情况）能尽快解决（改进）。

Your effort to provide good services will be highly appreciated by all.

我们会很感激您作出的一切努力。

We will appreciate your willingness to make up for the loss.

我们真的希望你们能对损失作出补偿。

Inquiry

I would like to request some information about...

我想对_______问题向您咨询。

My first question is... 我的问题就是__________。

I am greatly concerned about... 我对_________较为关注。

Should I need to send further materials, please let me know.

我是否需要再寄其他资料给你，请及时告知。

Could you be so kind as to send me some relevant booklets on the above-mentioned aspects.

能否针对上述的问题寄些相关的小册子给我。