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Possible Duplicate:
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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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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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. – Kit Z. Fox 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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