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Proper usage of “since” and “from” with regard to duration of time
Is “since I’m” now an acceptable alternative to “since I was”?

With the Present Perfect (Progressive) "since" can be used when a reference point is indicated, e.g.:

I've been working here since last month.

Can I use "since 2 months ago" as a reference point, as in:

I've been working here since two months ago.

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Also related: Since more than six months and this. –  Robusto Dec 21 '12 at 15:22
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Oh...the actual duplicate seems to be your second link. –  Mitch Dec 21 '12 at 15:52
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marked as duplicate by Robusto, Mitch, MετάEd, FumbleFingers, RegDwigнt Dec 22 '12 at 4:06

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2 Answers

You can't; it’s not advisable at all, it sounds like a common English-as-a-foreign language error.

Since has to have a specific time reference. Two months ago is such a reference, but a reader might initially be confused by seeing since followed by two months, which would normally be preceded by for. The correct alternatives are:

I`ve been working here for two months

or

I started working here two months ago.

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Whatever reference you and @Barrie are using, you really ought to cite it. –  KitFox Dec 21 '12 at 15:06
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No reference. I just copied most of Barry's answer for effect. I agree with absolutely everything he said except for the first two words. –  Mitch Dec 21 '12 at 15:13
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You can, but it’s not advisable. Since has to have a specific time reference. Two months ago is such a reference, but a reader might initially be confused by seeing since followed by two months, which would normally be preceded by for. Better to write either I`ve been working here for two months or I started working here two months ago.

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