If I'm waiting for something happen and I know that it will happen in 3 months. Can I say "When 3 months run out I'll do it". Is that grammatically correct?

  • It doesn't sound natural. Might be you mean "I will do it within the next 3 months". – Pam Aug 9 '18 at 12:38
  • I mean that I will start doing something after 3 months actually. For example: I'll be able to request comments from the authorities when 3 months have passed. I'm not sure if this phrase sounds natural to you. – Dmitry Kuzbassov Aug 9 '18 at 13:12
  • Whilst it's true we say things like time is running out, your usage is not at all idiomatic. About the only context where I can imagine [some specified time duration] running out is where that specific duration has already been identified as contextually relevant, in which case it just about works if an article is included: It only comes with a three-month guarantee, but when the three months run out you can still get it repaired for a nominal fee. But it's not very good even there, to my ear. – FumbleFingers Aug 9 '18 at 13:21
  • That's clearer. I think I'd say "I will do it in three months' time (and not before)". Although, personally, I'd specify an actual month for the task to start because I find the inanimate possessive apostrophe in that sentence confusing. – Pam Aug 9 '18 at 14:12
  • No, that's not correct and if it was, I suggest you should take it either to English Language Learners or even to a site dealing with writing style. – Robbie Goodwin Aug 12 '18 at 17:30

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