根据你和你朋友的亲密度，可以用不同的开头方式，不一定非要拘泥于英文固有开口格式
如果是非常熟悉关系感觉像朋友的人，可以直接用 Hi ***，开头， ***是名字（一般不用姓），第一个字母大些，Hi后面不带逗号只有空格，名字后面加逗号。然后另起一行写正文。
如果已经很熟悉但感觉还算不上朋友的人，Dear ***，开头， ***是此人的名字
如果是不熟悉的人，用Dear Mr.*** ；Dear Ms ***开头，***是此人的姓。
如果第一次写信且不知道姓名，用Dear Sir， Dear Madam
拓展例文：
1.
My honey! Zhang Wei,
I’m glad to know that you are coming to my city during the summer vacation.
However, I’m afraid there’s some bad news. I’m planning to take part in an international conference to be held in another city during the time of your visit.
All the top scientists in my field will show up at the conference. More importantly, I’m lucky enough to have been selected to give a speech on behalf of my research team at the Conference. I really can’t miss it.
I understand that it’ll be your first time to this city and I’m your only friend here. I’ve asked my roommate to meet you at the airport, and you can stay in my room.
He is a very nice person and he will show you around the city. Hope you two will get on well and have a nice holiday!
Yours,
Li Ming
2.
Hi! Lily,
How is everything? I do not see you for a long time, and I miss you very much. So I write to you. I was very busy in the last month, because I have much homework to do. The final exam is coming, so I must work hard. Besides, I must learn piano very two days. It takes me some time, but I feel happy. These are my life in recent. And what’s yours? I am looking forward to your letter and tell me about your life.
Sincerely Yours,
Carla
3.
Dear Kate,
This term I moved to a new house and studied in a new school. But I always missed my friend. My old house was move comfortable than this new house. I wanted to go back to my old house.
Everything was strange for me,so I couldn't study better. I felt nervous in the first test. And I got bad scores,I felt very sad. The teacher shouted at me. And then,I felt under too much pressure and very tired. My parents were also sad with me. When my classmates knew this thing,she helped me,and gave me some advice. Later,I thought I can be better next time.
I hope to get on well with everyone and get a good mark soon.
Yours
Jane
4.
Dear Lucy,
I am so glad to receive your letter and happy to know that you have a pleasant holiday. Please send my sincere wishes to your parents. I have a happy holiday just like you do. This holiday, I visited to Guangzhou with my parents. Guangzhou, also known as the Flower City, there are many flowers along the both sides of streets. It’s very beautiful. Besides, the environment is clean and the climate is comfortable. There are many skyscrapers in Guangzhou, especially in the downtown. We visited to many tourist attractions. They are all worth visiting. I hope you can visit there personally one day. You must like it.
Best wishes.
Sincerely yours,
Alva
5.
Dear John,
Long time no see, how is your summer vacation? I’m really sorry for writing so late. I have been too busy at this moment. I am happy to hear that you have traveled to Tibet at this summer holiday. How I wish I could go there with you!
Let me tell you something about my summer holiday. My summer holiday is rich and colorful. My parents take me to Hong Kong. That’s a beautiful place. I buy a lot of funny things at there. Such as pretty dresses, cute dolls and the snacks I never eat before. I really want to stay there and never come back! In a word, I really appreciate the life there.
I’m really looking forward to your reply!
Yours
Jane
（1）写给亲人、亲戚和关系密切的朋友时，用Dear或My dear再加上表示亲属关系的称呼或直称其名（这里指名字，不是姓氏）。例如：My dear father，Dear Tom等。
（2）写给公务上的信函用Dear Madam，Dear Sir或Gentleman（Gentlemen）。注意：Dear纯属公务上往来的客气形式。Gentlemen总是以复数形式出现，前不加Dear，是Dear Sir的复数形式。
（3）写给收信人的信，也可用头衔、职位、职称、学位等再加姓氏或姓氏和名字。例如：Dear Prof. Tim Scales, Dear Dr.John Smith。
拓展资料：
英文书信一般由以下六部分组成:信头、信内地址、称呼、正文、结尾、签名。
（1）信头(Heading)
信头是指发信人的地址和日期，通常写在第一页的右上角。行首可以齐头写，也可以逐行缩进写。地址的书写顺序由小到大:门牌号、街道、城市、省(州)、邮编、国名，最后写发信日期。私人信件一般只写寄信日期即可。
（2信内地址(Inside Address)
信内地址要写收信人的姓名和地址。在公务信件中要写明这一项,在私人信件中，这一项常常省略。该项写在写信日期下一行的左，上角，格式与寄信人地址一样。
（3）称呼(Salutation)
称呼是对收信人的称谓，应与左边线对齐，写在收信人姓名、地址下面1至2行处。在称呼后英国人常用逗号，美国人则常用冒号。在私人信件中可直呼收信人的名字，但公务信件中一定要写收信人的姓。大部分信件在称呼前加“Dear”。
（4）正文(Body of Letter)
正文是书信的主体。与中文信件不同的是，英文书信的正文的开头不是先写一些问候语，再阐明写信的目的，而是直接说明写信人的身份及写信的目的，然后提出写信人的情况、 想法或要求,并加以必要的解释或说明。英文书信陈述目的时，应该直截了当，意思明确,层次清楚，言简意赅。
（5）结尾礼词(Complimentary Close)
公务信件的结尾礼词包含两部分:发信人的结尾套语与署名。 结尾套语写在签名.上面一行，第一个字母要大写,套语结尾后面要加逗号。在公务信件中，发信人常用的结尾套语。
一般英语书信中的称呼语使用:
如果是给自己的朋友或很熟悉的人,Dear或My dear后跟直呼其名(这里指名字,而不是姓)如:Dear Tom,Dear Aunt Lily,My dear.
如果是工作上生意上的关系,可以写成:Dear Mr.Green,Dear Mrs.Green.
如果是给某个部门,单位,又不知姓名和性别,可写成Dear Sir or Madam或Dear all等
拓展资料：
Dear ***
I live in**。I have many friends here, for example,my best friend **。We always go bike riding，she often gives me some beautiful presents.And my friend ** is good with me , too.We always play baskat ball after school. And**……
As you can see ,I have many good friends ,and they are good with me !
Yours
**
(**处自己加名字)应该可以的
【格式说明】
英语书信一般分为信头、称呼、正文、谦称和结束语以及签名等五个部分。
信头指写信人的地址和写信日期，通常写在信纸的右上角。信头常用并列式，即每行开头要平齐。写信头时一般先写地址，后写日期。写地址应从小到大排列。如：门牌号码、街道名、城(县) 名、省名、国名。邮政编码一般写在省市名称之后。写信日期位于写信人地址之后，通常空开一行。英语中日期有两种写法，一种是按月、日、年的顺序排列，另一种是按日、月、年的顺序排列。
称呼：称呼是对收信人的称谓。通常在收信人地址下面两行处写，与收信人地址齐头。英文信的称呼一般以Dear…开头。给亲属写信时，可在Dear后加上亲属关系的词，例如Dear Uncle, Dear Grandpa等；写给朋友或自己平辈的人可直呼其名，如Dear Tom, Dear Xiao Ming等；写给不太熟悉的人可根据收信人性别分别在姓氏前加上Mr. , Mrs.或Miss 等。例如Dear Mr. Smith, Dear Mrs Smith。注意Mrs用于已婚女性，其后要接其丈夫的姓。此外，还可根据收信人的身份冠以学位、头街等。例如Dear Doctor Li, Dear President Black。称呼语的末尾常用逗号，美国多用冒号。
正文：正文是书信的主体部分。一般来说，书信正文的首行与称呼这一行要距离一行或两行，正文每段段首向右缩进5个字母。正文要求简明扼要，层次分明，语言准确得体，能表情达意。特别要注意的是英文书信，不像中文信中用“你好！”开头，不要画蛇添足，加上一句“How do you do?”等之类的问候语，但可以用询问情况来作为正文的开头，如 How are you getting along with your study? (你近来学习情况如何?) 此外，如果是写回信，应先提到已收到对方的信，并表示谢意，如I was happy to hear from you. (收到你的来信我很高兴。) Thank you for your letter of March 21. (谢谢你3月21日的来信。) 等。然后再回答对方的问题，或者叙述的事情等。
谦称和结束语：英文书信中的谦称和结束语相当于我们通常用的客套语。它位于正文之后，结束话一般单独成行，可写在信笺中间(居中)，也可从中间处起向右写。首写字母要大写，句末用逗号。常见的结束语有：Best wishes! (祝好！)/ With best regards! (顺致问候！) /Wish you success(祝你成功) / Good luck! (祝你好运！)/ I’m looking forward to hearing from you soon. (盼你早日回信。) Give me love / regards to…(代我向……问好！) 谦称有尊卑亲疏之分，要与收信人的称呼相一致。写给亲友常用Yours, / Yours affectionately, / Yours ever, / Affectionately yours，等。写给一般的熟悉的人常用Yours sincerely, / Sincerely yours, / Yours cordially, 等。写给不太熟悉的人常用Yours truly, / Truly yours, / Yours faith fully, 等。写给长辈或上级常用Yours respectfully,等。
签名：签名即写信人的姓名。签名的位置是在谦称和结束语下面一行至两行处。除了对熟悉的人或亲密的人以外，签名必须写全姓名。
一般英语字母中地址的使用是：
如果是为你自己的朋友或一个熟悉的人，亲爱的或亲爱的，后面跟着它的名字（名字，而不是姓），比如亲爱的汤姆，亲爱的莉莉阿姨，亲爱的，
如果是工作中的商业关系，它可以写为亲爱的格林先生，亲爱的格林夫人。
如果它是给一个部门或单位，没有名字或性别，它可以写为亲爱的先生或夫人或亲爱的所有。
务必避免以下文字：
亲爱的朋友
亲爱的先生，女士，
亲爱的经理
亲爱的朋友
亲爱的女士和绅士
拓展资料
一般英语字母中地址的使用是：
如果是为你自己的朋友或一个熟悉的人，亲爱的或亲爱的，后面跟着它的名字（名字，而不是姓），比如亲爱的汤姆，亲爱的莉莉阿姨，亲爱的，
如果是工作中的商业关系，它可以写为亲爱的格林先生，亲爱的格林夫人。
如果它是给一个部门或单位，没有名字或性别，它可以写为亲爱的先生或夫人或亲爱的所有。
务必避免以下文字：
亲爱的朋友
亲爱的先生，女士，
亲爱的经理
亲爱的朋友
亲爱的女士和绅士
