In French, to express [duration] + "ago", you use the expression "il y a".
How to express duration with " il y a" in French
Look at these sentences:
J'ai mangé il y a une heure.I ate an hour ago.
Il est venu à Londres il y a cinq ans.He came to London five years ago.
Ils sont arrivés il y a trois jours.They arrived three days ago.
Notice that to say "ago" in French, you use the expression "il y a" followed by the time duration.
You cannot say ''un mois il y a'' (unless you're Yoda!)
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