s’il avait su
If he'd known the truth, he'd have told me.
S’il avait connu la vérité, il me l’aurait dit.
Well, if he'd known, I'm sure he would have told me.
Eh bien, s’il l’avait su, je suis sûr qu’il me l’aurait dit.
— Ikiru (1952)
He would've told us if he'd known.
Il nous l'aurait dit s'il l'avait su.
If he'd known, he would've told us.
S’il l’avait su, il nous l’aurait dit.