证明书种类很多，有工作经历证明、工作经验证明、病情证明、留学生经济担保书、学业成绩证明书等等，是用来证明一个人的身份、学历、婚姻状况、身体情况等或某一件事情的真实情况。证明信的写法通常也采用一般信件格式，但多省掉收信人的姓名、地址和结束用语。称呼多用“To Whom It May Concern”意即“有关负责人”，但此项也可省略。写证明书要求言简意赅。
医生证明书 Doctor‘s Certificate
June. 18, 2000
This is to certify that our patient, Mr. Thomas, male, aged 41, was admitted into our hospital on June 9, 2000, for acute appendicitis. After immediate operation and ten days of treatment, he has completely recovered and will be discharged on June 19, 2000. It is suggested that he rest for one week at home before resuming his work.
Jack Hopkins
Surgeon-in-charge
医生证明书
2000年6月18日
兹证明病人托马斯先生，男，41岁，因患急性阑尾炎，于2000年6月9日住院。经立即施行手术和十天治疗后，现已痊愈，将于2000年6月19日出院。建议在家休息一个星期后再上班工作。
主治医生：杰克·霍普金斯
公证书 Certificate
(90)Lu Zi, No. 1130
This is to certify that Mr. Zhao Qiangwen holds a diploma issued to him in July, 1980 by Shandong University (Diploma No. 064) and that the seal of the of the said University and the signature by President Zhou Yongsen are authentic.
Jinan Notary Public Office
Shangdong Province
the People‘s Republic of China
Notary: Wang Fang
May 2, 2000
证明书 1. 关于寄出CD的证明
CERTIFICATE
This is to certify that this disc is the pics about our company’s products, that not including any endanger country security and other illegal information.
COMPANY
DATE
2. 工作收入证明
Certificate of Employment and Income
This is to certify that ** has been working with this unit since ****. At present he works as ******. His duty is *******. During the period of ****~****, the sum of his income is about ***** RMB annually, including the salary and the subsidies. The personal income tax is deducted by this unit on his behalf.
Tel:
3. 学历证明
Certification of Educational Background
CERTIFICATE
This is to certify that Mr.**, male, born in ** county, *** Province, in 19**, was admitted into the Department of ***( Computer Science and Engineering of ***University) in (date), majoring in (subject). He graduated from the University in (date) with a degree of Bachelor in (subject)
date
4. 健康证明(出国手续会遇到）
HEALTH CERTIFICATE
This is to certify that Mr***, male, aged **, (job), his health is excellent and capable of going to (country) to attend the (exhibition or conference).
DATE
5. 盒装寄出样品证明
The Declaration of non- Wood packing material
To: ....***GENERALADMINISTRATION FOR ENTRY-EXIT INSPECTIOIN AND***
It is declared that this shipment no.***. piece 1. weight** kgs, including its parcel does not contain any wood packing material.
DATE
COMPANY