I freely admit that I made a mistake.

我爽快地承认我犯了错误。

《牛津词典》

Chen did not dare a response. After a minute, he said, "I made a mistake."

小陈语塞了。过了一会，才说：“我错了。”

《新英汉大辞典》

Then I made a mistake.

这时我犯了个错。

youdao

At first it seemedlike I made a mistake. It was onlymy induction day, and I was getting yelled at.

VOA: standard.other

John Milton has made a mistake. He's made a literary mistake and, as I think all editors know, Spenser does not.

约翰·弥尔顿犯下了一个错误，他犯下了一个文学上的错误，而且我认为所有的编辑都知道，这个错误斯潘塞没犯过。

耶鲁公开课 - 弥尔顿课程节选

I must have made a mistake on my project.

我肯定在项目里出什么差错了。

Must 课堂 - SpeakingMax英语口语达人

The orchestra broke up laughing, for in five years I had never made a noticeable mistake.

WSJ: Cello's Golden Age Comes to a Close | J��nos Starker | By Stuart Isacoff

She recognized that I was devastated because I had made such a huge mistake.

FORBES: What I Learned from Leaving the Safe Unlocked

Again and again, the truth was confronting me: I was a born townie, and I had made a dreadful mistake in coming here.

NEWYORKER: Fjord of Killary