certify

1. certain / certainly => certify.

certify 证明，证实

来自词根cert, 确定，见certain.

certify (v.)

mid-14c., "to declare the truth of," also "to vouch for or confirm" (an official record, etc.), from Old French certefiier "make certain, witness the truth of" (12c.), from Late Latin certificare "to certify, to make certain," from Latin certus (see certain) + root of facere "to make, do" (see factitious). Also used in Middle English in broader senses of "inform, give notice; instruct, to direct; to designate." Related: Certified; certifying. Certified public accountant attested from 1896.

1. This swimming certificate is to certify that I swim one hundred metres.

这张游泳证证明我可以游100米.

2. Can you certify for his ability as a teacher?

你可以保证他能胜任老师的工作 吗 ?

3. I can certify to his good character.

我可以证明他品德好.

4. The National Election Council is supposed to certify the results of the election.

全国选举委员会应对选举结果出具证明。

5. Each year they audit our accounts and certify them as being true and fair.

他们每年对我们进行账务审核，以确保其真实无误。

【certify, testify, verify, rectify】
这是一组形近易混词。
certify: v.证明，声称是真的。
• He certified it was his wife's handwriting. 他证明那是他妻子的手迹。
testify: v. (在法庭上)宣誓作证；表明。
• He is the only person who can testify in this case, because the other witnesses were killed mysteriously. 由于其他的证人已经被神秘地杀害，他成为这件案例中唯一可以作证的人。
verify: v. (用事实)证实或核实。
• I verified the store's address by calling to check it. 我打电话询问，以核实商店的地址。
rectify: v.改正，纠正；整顿。
• He rectified the mistake in the contract by changing its wording. 他通过改变措辞纠正了合同里的错。

【certify, demonstrate, prove, testify, establish】
这组词都有“证明、证实”的意思，其区别是：
certify: 较正式用词，多指有签字盖章的、合符法律程序的书面证明。
demonstrate: 指通过推理、辩论、实验或以实例来证明事物的正确与否。常用于理论、学说、定律等的证明上。
prove: 普通用词，指通过某种手段或方式提供证据以证实或证明某事物真实与否，某结论正确与否等情况。
testify: 较正式用词，既指出庭作证，提供证据，又指为某人或某事的是否真实提供证据或证明。
establish: 指证实事实或理论的真实性与正确性，使其能长期存在或为人们所接受。