1.certify的基本意思是“证明”,指以盖章或签字的手段正式证实某事的真实性，引申可表示“发证书给…”。
2.certify在英式英语中表示“正式宣布某人有精神病”,是非正式用语。
3.certify是及物动词,接名词、代词作宾语,也可接that从句。certify还可接以“as/to be+n./adj.”充当补足语的复合宾语。

certify for(v.+prep.)
保证 assure
▲certify for sth
We can certify for her competence as a secretary.我们可以保证她能胜任此秘书工作。
Can you certify for his ability as a teacher?你可以保证他能胜任老师的工作吗?

certify to(v.+prep.)
证明 give evidence of
▲certify to sth
I can certify to his good character.我可以证明他品德好。
I believe it to be true, but I am not able to certify to that effect.我相信它是真的,但我不能证实其真实性。

用作及物动词
▲S+～+n./pron.
The manager certified this check.经理确认了这张支票。
The bank certified my accounts.银行核实了我的账目。
The bank certified his account number.银行核实了他的账号。
The authority certified the teachers.管理部门给教师颁发了证书。
◇ 用于be ～ed结构
You should be certified, you're mad.应该宣布你为精神病人,因为你疯了。
▲S+～+that-clause
I certified that the facts written here are the truth.我保证这里所写的属实。
I certify that I witnessed the signing of this document.本人为此项文件签字过程之见证人。
I certify that he is an honest student.我证明他是个诚实的学生。
The diploma certifies that you have completed high school.本文凭证明你已修完中学课程。
▲S+～+n./pron.+(as/to be) n./adj.
I certify this as a true copy of his letter.我证明本件确系他信件的副本。
He certifies this to be true.他证明此事属实。
The doctor certified the prisoner insane.医生证实这个被拘押的人精神异常。
◇ 用于be ～ed结构
The accounts were certified as correct.经核查账目无误。
The planes were certified airworthy.飞机被证明适于航行。