I can certify to his innocency.

我可以证明他清白。

youdao

I can certify to his good character.

我可以证明他品德好。

youdao

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。

youdao

The court ruled that Franken is "entitled" to the senate seat, but stopped short of ordering the governor to officially certify him.

VOA: standard.2009.06.30

"We will ask all states to put in place a plan to adopt and certify standards that are college and career-ready in reading and math."

VOA: standard.2010.02.22

The six nations will allow companies to self-certify where goods come from so they no longer have to spend time and money going though export authorities.

VOA: standard.2009.11.09

Until last year, FCC rules didn't require carriers to certify to the FCC that subscribers were eligible.

WSJ: Millions Improperly Claimed U.S. Phone Subsidies

These are local fishing vessels and workboats that we certify to help us, and then also certify the individuals and train them thereon.

WHITEHOUSE: Daily Press Briefing

This includes Certifying Acceptance Agents (CAAs) who can certify to the IRS that they have verified the authenticity of the documents, like passports, so those original documents will not have to be mailed.

FORBES: In Effort to Curb Immigration Related Fraud, IRS Changes ITIN Procedures