1.稱呼。
稱呼為“小李叔叔”、“紫涵姐姐”等，還可以在“稱呼”前加上“尊敬的”“親愛的”等詞語，表達自己的敬愛或尊重之情。
稱呼要寫在第壹行，頂格寫。
2.正文。
把想要告訴對方的話條理清晰地寫下來，如果要說的事有好幾件，可以每件事寫壹段。
如：給親人寫信，可以跟對方說說自己最近的學習和生活，可以說說家裏人的情況，可以說任何想說的話，也可以傾訴自己的心聲，或委屈、或想念，或感謝。
比如跟親人說自己最近學習有進步，得到了老師的表揚；聊聊自己最近讀的書；說說前段時間去哪旅遊了、長了哪些見識；說說家裏又添了壹個新成員——小寵物泰迪狗；爸爸工作很忙，有時周末要加班；媽媽身體好壹些了不咳嗽了……
總之，寫信就是表達自己的心聲，可以和對方說任何想說的話，也可以多聊聊對方關心的事。
如果對方很關心妳的學習，就多跟對方聊聊妳的學習情況；如果對方很關心家裏人的身體，就多跟對方說說家人的健康狀況……
3.祝福語。
說完想說的話後，通常要向對方致敬或祝福。
另起壹行，空兩格寫“此致”，再另起壹行頂格寫“敬禮”。
也可以寫其它的祝福語，另起壹行寫“祝”，再另起壹行頂格寫“身體健康、萬事如意”等。
4.署名和日期。
在信紙的右下方寫上寫信人的名字，如“學生王琪”、“表妹彤彤”等。然後在署名的正下方寫上日期。
例文《給奶奶的壹封信》：
例文《給鄭淵潔叔叔的壹封信》：
擴展資料：
英語的書信格式
感謝信 appreciation， thank
道歉信 apology， apologize， sorry
申請信 apply，application
求助信 ask sb。 to do， ask for help
咨詢信 inquire, ask for information
邀請信 invite, invitation
辭職信 resign, resignation
建議信 suggest, advice, suggestion
投訴信 complain, complaint
書信格式：
Dear XXX
第壹段
第二段
第三段
Yours sincerely，
John
書信格式 - 稱謂
認識對方：
Dear Tom,
Dear Mr. Smith,
Dear Mrs. Smith
Dear Ms. Smith,
Dear Professor Thompson,
Dear Mr. Professor,
Dear Mr. President,
不是說妳跟對方熟不熟悉，而是說，妳知不知道妳要跟誰講話。
不認識對方：
Dear Sir,
Dear madam,
dear sir or madam,
dear mr. manager,
dear mrs. president,
dear fellow student,
dear friend (s),
結尾
yours sincerely,
yours faithfully,
best regards,
yours sincerely, is typically employed in english when the recipient is addressed by name (e.g. Dear john), and is known to the sender to some degree, wheres yours faithfully is used when the recipient is not addressed by name, (i.e. dear sir/madam) or when the recipient is not known personally by the sender.
kind regards, and especially best regards, is meant as a way of addressing close friends or loved ones or a close working relationship. a common error is to say best regards or kind regards in formal letters which perhaps shows a misunderstanding of the term.
書信詳細內容：
第壹段： 自我介紹，寒暄，寫信目的
i am .... a .... of ......
it has been several weeks since we last met. how are you doing?
感謝信：i am writing to extend my most sincere appreciation for .....
道歉信：i am writing to offer my most sincere apology for ...
求助信：i am writing to seek your most generous help with ....
邀請信：i am writing to invite you to .....
咨詢信：i am writing to inquire about ...
求職信：i am writing to apply for ... you advertised
辭職信：i am writing to formally request to resign from my current post of ....
歡迎信：i am writing to welcome you to ...
投訴信：i am writing to express my deepest dissatisfaction about...
推薦信：i am writing to strongly recommend ... to you
建議信：i am writing to make/offer some suggestions about ...
第二段：詳細的起因經過結果
第三段：結尾
thanks for everything you have done
sorry for any inconvenience caused
it would be highly appreciated if you could....
please feel free to contact me if you have any further questions. i can be reached at phone..... i am looking forward to hearing from you soon.