"I've been working here since two months ago" [duplicate]
Solution 1:
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.
Solution 2:
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.