1.confirm的基本意思是“证实”“确定”,指以不可辩驳的事实或不容置疑的陈述证实某事的真实性、准确性、正确性以及有效程度，引申可表示为“认可”“坚定”。
2.confirm是及物动词,其主语多为人,宾语可以是名词、代词或that从句,也可接以as短语充当补足语的复合宾语。

confirm in(v.+prep.)
▲confirm sb in sth
1.确定某人在…中的位置 make sb sure of belonging to sth
When do you think the President will confirm you in office?你认为总统将在什么时候批准你任职?
2.坚定某人的信念 strengthen sb in sth such a belief or habit
This latest information confirms me in the belief that he is to blame.最近这一消息使我坚信他该受到责备。
◇ 用于be ～ed 结构
I am confirmed in my opinions by what you told me.你所告诉我的话,使我的看法更为坚定了。

用作及物动词
▲S+～+n./pron.
What he observed confirmed his judgement.他观察到的现象证实了他的判断。
We have confirmed the report.我们证实了那则报道。
The agency confirmed the contract.经销处批准了合同。
The news confirmed my resolution.这消息坚定了我的决心。
◇ 用于be ～ed 结构
The statement has been confirmed by testimony.供述已为证据所证实。
It is confirmed by experience.这已经被经验所证实。
They worked out an effective method, which was confirmed by the leadership.他们制定了一种有效的方法,这种方法得到了领导的认可。
▲S+～+that-clause
The announcement confirmed that the election would take place on June 20th.公告证实选举将在6月20日举行。
The king confirmed that the election would be on July 20th.国王批准选举在7月20日举行。
◇ 用于be ～ed 结构
It is confirmed by experience that this is the right approach to the command of grammar.经验证明这是掌握语法的正确途径。
▲S+～+n./pron.+as n.
The President confirmed him as secretary of state.总统任命他为国务卿。
◇ 用于be ～ed 结构
He was confirmed posthumously as a member of the Chinese Communist Party.他被追认为中国共产党党员。

confirm, authenticate, corroborate, substantiate, verify
这组词都可表示“证实”“确定”。它们之间的区别是:
confirm指以事实或不容置疑的陈述来证实某事的真实性、准确性、正确性以及有效程度; verify侧重以具体的事实和细节为证据;corroborate指以陈述或新证据作进一步的证实; substantiate强调某事需要证明,并以此提出充分的证据; authenticate指专家或内行的证实。