Can I use since and ago together?
I wonder whether it is grammatically correct.

Thank you in advance.

Question

Can I use since and ago together?
 I wonder whether it is grammatically correct.

Thank you in advance.

Answer

Normally, "ago" refers to a completed time - it's in the past. Since, on the other hand, refers to a time when something began and continued up to another point.

I came here a year ago. (completed time/action)

I've been here since 3pm. (incomplete time action)

You might see :

I've known him since about a year ago.

I've known him since February, 2005.

'A year ago' identifies a point in the past, in the same way that I might say 'February 2005'.

How long have you been writing?

I have been writing ince about a minute ago.

Translation: I have been writing for about one minute from 1 minute which happened in the past. Ago is a synonom to say "happened in the past"

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