I'll never do this sort of thing.

我决不干这等事。

《新英汉大辞典》

You must never do this.

这件事你做不得。

《新英汉大辞典》

I would never do this to him.

如果是我就绝不会这样做。

youdao

He'd never do this to someonewho had another choice.

VOA: standard.other

- And we could never do this-- and one could never do this experiment today but let me go through it with you and you'll apologize for its--some of its qualities.

我们不能再-,这种实验，如今再不能做了,我给你们从头至尾讲一下,因为实验中性别歧视的原因，我再次道歉。

耶鲁公开课 - 心理学导论课程节选

I've read through the same thing twenty times and I've missed something obvious. Someone who's never seen it before looks at and says, did you really mean to do this?

但是它们有一双旁观者之眼,我把同一段代码读上20遍,都会漏掉一些很明显的错误，从没看过这段代码的人会告诉我？

麻省理工公开课 - 计算机科学及编程导论课程节选

"I want to make sure that they never do this again, to anybody, " she said.

CNN: SHARE THIS

Never do this, especially if the email purports to be from a financial institution or credit-rating service.

WSJ: T-Mobile's Pricing for the HTC One

"There are some people who say we should never do this, from an ethical point of view it is wrong to tamper with the genes of future generations, " he told BBC News Online.

BBC: Scientists oppose human gene modification