This sentence doesn't sound natural at all, and it is not written in present perfect. " Have + been would be used in the present perfect continuous form, but then your verb would have to be in the continuous form as well; not the past participle. It seems like it's been ages since you have gone.
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Laborious- It seems like it's been ages since you have been gone.If you want present perfect, you need a different example.
GPYit is the present perfect tense of "be", with "gone" functioning as an adjective.Oh. OK. My brain was seeing something weirdly passive there, and I didn't think it through.
LaboriousIsn't itOf course it's possible. I gave you these sentences earlier. (See below.) They use the present perfect after since. They are fine grammatically.neverever possible to use present perfect after since, please?