ago: [14] Historically, ago is the past participle of a verb. Its earlier, Middle English, form – agone – reveals its origins more clearly. It comes from the Old English verb āgān ‘pass away’, which was formed from gān ‘go’ and the prefix ā- ‘away, out’. At first it was used before expressions of time (‘For it was ago five year that he was last there’, Guy of Warwick 1314), but this was soon superseded by the now current postnominal use. => go
ago (adj.)
early 14c., shortened form of Old English agan, agone "departed, passed away," past participle of an obsolete verb ago "to go forth," formed from a- "away" (perhaps here used as an intensive prefix) + gan "go" (see go (v.)). Agone remains a dialectal variant.
例文
1. Mechanization happened years ago on the farms of Islay.
数年前、エレの農場は機械化されていた。
2.Rationing had put an end to a surfeit of biscuits long ago .
定量供給はずっと前からビスケット過剰の状況が終わっていた。
3.Just a few days ago ，I finished a commission.
は数日前、私は創作を依頼しました。
4.I qualified as a doctor from London University over 30 years ago .
30年以上前、私はロンドン大学を卒業し、医療資格を取得しました。
5.Their water was turned off weeks ago without explanation.