The phrase "ago we know" is not correct and does not make sense in written English.
It seems to be an incomplete thought or a misphrasing, as "ago" typically refers to a point in time in the past and does not logically connect with "we know."
Example: "Years ago, we know that the world was different."
Alternatives: "in the past, we know" or "previously, we know".
See Eric Schmidt's memorable faux pas at the D9 conference a few weeks ago ("We know where you live").
Martin's next novel in his A Song of Ice and Fire series, The Winds of Winter, follows 2011's A Dance with Dragons (it seems like ages ago, we know).
As the president of the European commission [Jean-Claude Juncker ] said some time ago, we know what to do, the trouble is getting re-elected after we do it, and I think there is a very strong element of that here.
With Google having placed a canoe-sized Eclair on their lawn a few days ago, we know that the next update for Android (codenamed "Eclair", version number 2.0) can't be too far off.
In addition, Davidson says that "as Axel Olrik (1901) pointed out long ago, we know very little about Gefion, and it is possible that she can be identified with Frigg or Freyja" and not only does the Prose Edda associate her with an afterlife realm of the dead, "in Lokasenna, Loki claims that Gefion was given a jewel by a lover, traditions that would fit in very well with what we know of Freyja".
Many years ago we know he paid no taxes for several years -- and he likely used every trick in the book to avoid paying taxes throughout his career.
Years ago we knew and loved a graceful girl who had the gait of a pacer She was the highest-stepping female we had ever been crazy about.
Thirty years ago, we knew that vast quantities of oil and gas were buried in deep underground shale formations.
A mere hundred years ago, as we know, Jews were hounded and imprisoned, and worse was yet to come.
Three and a half years ago we knew where the fuel rods were.
"When we began this project two-and-a-half years ago we knew there would be periods when players would be missing, either injured or on test duty.
