Usage Note
Hier is used adverbially and never changes form. Common compounds include avant-hier (the day before yesterday) and hier soir (yesterday evening). To say something is outdated, French uses the idiom c'est de l'histoire ancienne (literally 'that's ancient history').
Examples
"Je l'ai vu hier matin."
Natural Translation
I saw him yesterday morning.
Literal Translation
I him-have seen yesterday morning

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