Making sentence "serve time" and "do time" Here is a quote from a certain film. A) Now, our only requirement is that none of you have ever served any time in jail. And I tried and made a paraphrase of A, into the following B. B) Now, our only requirement is that none of you have ever done any time in prison. I just learned by dictionary that the phrase "serve time" and "do time" are synonym, right? And I also changed "jail" into "prison" because they are synonym too. No problem, right? So all I want you to is confirm whether or not B is definitely fine. Does it sounds natural to you?