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Hello:

Using "Since a long time ago"
was considered incorrect some years ago, as far as I know. Is it now acceptable?
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Comments  (Page 3) 
There is no grammatical rule preventing this combination, and occasionally expressions using both (such as 'since one minute ago' in direct answer to the question 'since when?') may be encountered. Generally, however, we use a for-phrase to form a period adverbial.

He has lived in Taipei for three years. (acceptable) *He has lived in Taipei since three years ago. (tending to unacceptability)

Since she arrived in Tokyo two years ago, has Maryjo been really busy managing the Dayglow Movie Studio? (acceptable) [In this sentence, "since" is used to modify the whole clause "she arrived in Tokyo two years ago," not the phrase "two years ago."]
Since its original publication almost 20 years ago, the Synonym Finder has met with huge success among students, authors, speechwriters, and others in search of le mot juste. (acceptable) [In this sentence, "since" is used to modify the whole phrase "its original publication almost 20 years ago," not the phrase "almost 20 years ago."]
RishonlyHi Pinenut,

"You made your argument look stupid.. "

"Obviously you don't know..."

"I think you need to study grammar. "

I believe these sentences are impolite and would infuriate the recipient of the message. It is better we argue using our knowledge rather than using our emotions.
I second that or is it "third" that....

Students: We have free audio pronunciation exercises.
But what about this link?
I'd really like to understand this.

http://www.thefreedictionary.com/since+a+long+time+ago
.
What about it? This thread has already mentioned that the form is acceptable and in use, if perhaps a bit awkward.
.