From Longman Dictionary of Contemporary Englishagoa‧go /əˈɡəʊ $ əˈɡoʊ/ ●●●S1W1 adverbPASTused to show how far back in the past something happened5 minutes/an hour/20 years etc agoHer husband died 14 years ago.long ago/a long time agoHe should have finished at university long ago, but he kept taking extra courses.a minute/moment agoThe little girl you saw a moment ago was my niece.a little/short while agoTom got a letter from him just a little while ago.They moved to a new house some time ago (=a fairly long time ago).We had our bicentenary celebrations not that long ago.GRAMMAR: Patterns with ago• Use the simple past, not the present perfect, with ago. You say: I started a new job a few weeks ago.✗Don’t say: I’ve started a new job a few weeks ago.• Don’t use a preposition such as ‘at’, ‘in’, or ‘on’ before a phrase with ago. You say: They first met fifteen years ago.✗Don’t say: They first met at/in/fifteen years ago.• Don’t use ‘since’ or ‘before’ with ago. You say: I came to the US two months ago.✗Don’t say: I came to the US since/before two months ago.
Examples from the Corpus
ago• Thirty years ago 33 % of universitystudents were female; now there are more women than men.• "When did you hurt your back?" "About a fortnightago".• Michael left the office 20 minutesago.• Michael left the office about half an hourago.• My daughter was married just over a year ago.• Pauline wrote to me once, but that was agesago.• We went down to see a show in London not so long ago.• After all, he was supposed to have been hanged half a centuryago.• Even their twittering seems fairly low-keycompared with the excited sounds they made just a few weeks ago.• The good oleboys had their day two years ago.• "When did you live in Germany?" "Oh, it was a long time ago."• The only thing we ever get is old, stalenews about where they used to be, some time ago.• Did you see that program about genetics that was on a little while ago?• I met your father once, a long time ago.• Lucy's auntdied a few monthsago.• I had my keys a minute ago, and now I can't find them.• That was less than three and a half hours ago, but it might have been years.• The gun was pieced together over twenty years ago by Caltech geophysicist Tom Ahrens.• George went out half an hour ago. Can I have him call you back?• The company a year ago changed its reportingperiod to a fiscal year that ends March 31 from a calendar year.• How long ago did you buy the computer?• How long ago was that, Dad?some time ago• Her father died some time ago.• I lost my taste for sweetssome time ago.• The only thing we ever get is old, stale news about where they used to be, some time ago.• They moved to Chicago some time ago , a couple of years I think.• We did a job for Jett some time ago, and he told me to drop in whenever I was passing.• She had arrived with her parentssome time ago but seemed to be dancing with a matador.• She must have gone to bedsome time ago, else Jessie wouldn't have been able to sneak out.• The extent to which certainspecies of marinefishes may be tamed was publishedsome time ago in a popularweeklymagazine.• Maybe your financialposition has changed recently and plans you made some time ago need reviewing.