How are you doing?
How is everything going?
How is life treating you?
I amXXX, a 20-year-old boy currently studying in XXX college
I am XXX, who XXX
I heard that ...
My teacher told me...
I am informed that...
I learned that..
I read in your newspaper/ micro-blog /website that...
Now, I am writing to do sth.
Now, I am writing this letter to do sth.
Now, I am writing these few lines to do sth.
（“为了XXX，所以写此信”求职信就to apply for the job，感谢信就to express my heartfelt gratitude to you，邀请信就to invite you to join XX）
自荐信：Now, I am writing to apply for the job/position.
感谢信:Now, I am writing to show/ express my heartfelt gratitude to you.
邀请信：Now, I am writing to invite you to join/enjoy/suffer/experience the....(as our guest/ judge/ instructor).
建议信：Now, I am writing to give you a hand.
求助信：Now, I am writing to ask you to give me a hand/ do me a favor.
道歉信：Now, I am writing to show/ express my heartfelt apology to you.
告知信：Now, I am writing to tell you about the details.
There are four main reasons why I am fit for the job.
To begin with, ...
Every time I （看照片、看录像、看那段时间的日记、回忆那段经历）, I just can't help thinking of you/ what you have done for me.
It was so kind of you to （对方做的第一件事）.
Besides, you （对方做的第二件事）, which really surprised me.
Actually, I shall always remember （对方做的第三件事）, considering that,（第三件事情的意义）. Nothing will be able to erase our wonderful memories, and I will cherish them forever.
Here are some details for the activities.
To begin with, （活动主题或活动目的，如：the theme of the contest is "human and the nature", which is undoubtedly not only entertaining but also instructive. ）
Moreover, （活动的地点和时间，如it will be in room 501 from 2:00 to 5:00 on the afternoon of June 15th.）
What's more,（活动人员，如：ten outstanding competitors will take part in the contest.）
Finally, （其他信息，如：if you need any further information, please call me at 44876655. ）
There are several simple suggestions for you.
To begin with, ...
Hopefully you would be so kind as to give me some suggestions/help on the following problems.
To begin with,（困难一）,which has annoyed me for quite a long time.
Moreover,（困难二）, for personally I lack the very basic experience on this matter.
1、I have trouble in doing sth.
2、I find it extremely hard for me to do sth.
3、Doing sth is another terrible headache for me.
Hopefully the chance would be offered to me. If chosen/elected, I would dedicate all my energy and wisdom to the company/activity/club/class. Thank you for reading my letter/ listening to my speech in such a hot summer. Looking forward do your reply at your earliest convenience./ I won't let you down.（我不会让你们失望）
I, on behalf of my whole family/class/school, would like to thank you again (for what you have done) (for me/us). May you be blessed (in everything you do).
We are sincerely looking forward to your coming. My schoolmates/family and I would feel much honored if you could make it. I would like to meet you at the school gate and please drop me a line or give me a call to let me know your decision soon. Thank you.
Hopefully these suggestions will be of great help to you. If there is anything else I can do for you, please let me know as soon as possible. I'm sure you can solve your problem before long.
Hopefully your kind and timely help would be offered to me. Looking forward to your reply at your earliest convenience.
Hopefully you would accept my sincere apologize.