was the one who

était celui qui

→ be
phrase Common #2,242
était celui qui S’emploie pour insister sur l’identité de la personne ayant fait quelque chose. « Was » s’accorde avec un sujet au singulier ; avec un sujet au pluriel, on utilise « were the ones who ».
EN: Sarah was the one who found the lost dog.
FR: Sarah était celle qui a trouvé le chien perdu.

What makes you so sure Tom was the one who stole your bicycle?

Qu’est-ce qui te fait croire que Tom est celui qui a volé ton vélo ?

But I was the one who discovered how to identify them, okay?

Mais c’est moi qui ai découvert comment les identifier, d’accord ?

— Bugonia (2025)

Tom was the one who helped me paint the fence.

C’est Tom qui m’a aidé à peindre la clôture.

I hear Tom was the one who taught you how to play the cello.

J’ai entendu dire que c’était Tom qui t’avait appris à jouer du violoncelle.

Tom thought that Mary was the one who had told John to do that.

Tom pensait que c’était Mary qui avait dit à John de faire ça.

I was the one who had to make it happen.

C’est moi qui devais faire en sorte que ça arrive.

I was the one who asked you to lie.

C’est moi qui t’ai demandé de mentir.

— Moscow Does Not Believe in Tears (1980)

Tom was the one who planted these flowers.

C’est Tom qui a planté ces fleurs.

Tom told everybody he was the one who had done that.

Tom a dit à tout le monde que c’était lui qui avait fait ça.

She was the one who broke the window yesterday.

C’est elle qui a cassé la fenêtre hier.

Tom was the one who made me eat it.

C’est Tom qui m’a fait le manger.

Tom was the one who did that.

C’est Tom qui a fait ça.

I was the one who said we should wait.

C’est moi qui ai dit qu’on devrait attendre.

Tom was the one who was driving.

C’était Tom qui conduisait.

Natsumi was the one who told me about the sunshine girl's fate.

C’est Natsumi qui m’a parlé du destin de la fille du soleil.

— Weathering with You (2019)

I was the one who built this doghouse.

C’est moi qui ai construit cette niche.

Tom was the one who talked me into doing that.

C’est Tom qui m’a convaincu de faire ça.

Tom told me that Mary was the one who told him that.

Tom m’a dit que c’était Mary qui lui avait dit ça.

She was the one who suggested it.

C’est elle qui l’a suggéré.

Tom was the one who paid the bill.

C’est Tom qui a payé l’addition.

I was the one who suggested it.

C’est moi qui l’ai suggéré.

Maybe Tom was the one who stole Mary's necklace.

C'est peut-être Tom qui a volé le collier de Mary.

Tom was the one who bought my house.

C’est Tom qui a acheté ma maison.

Tom was the one who taught me how to milk a goat.

C’est Tom qui m’a appris à traire une chèvre.

Tom was the one who planted the roses in our garden.

C’est Tom qui a planté les rosiers dans notre jardin.

Do you think Tom was the one who stole that?

Tu penses que c’est Tom qui a volé ça ?

He was the one who suggested it.

C’est lui qui l’a suggéré.