je n'avais pas idée que

I had no idea that

→ je
phrase Uncommon #19,313
I had no idea that Used to express surprise about information you did not know previously. The verb after que is usually in the imperfect or another appropriate tense.
FR: Je n'avais pas idée que tu habitais si près.
EN: I had no idea that you lived so close.

Je n'avais pas idée que ce bracelet fut volé.

I had no idea that this bracelet had been stolen.

Je n'avais pas idée que vous saviez danser.

I had no idea you knew how to dance.

Je n'avais pas idée que tu étais impliqué.

I had no idea you were involved.

Je n'avais pas idée que tu savais jouer au mah-jong.

I had no idea you knew how to play mahjong.

Je n'avais pas idée que les choses étaient aussi mauvaises.

I had no idea things were this bad.

Je n'avais pas idée que vous saviez parler le français.

I had no idea you could speak French.

Je n'avais pas idée que tu étais impliquée.

I had no idea you were involved.

Je n'avais pas idée que tu savais parler le français.

I had no idea you could speak French.

Je n'avais pas idée que tu ressentais cela.

I had no idea you felt that way.

Je n'avais pas idée que vous vous sentiez ainsi.

I had no idea you felt that way.

Je n'avais pas idée que ce bracelet avait été volé.

I had no idea that this bracelet had been stolen.

Je n'avais pas idée que tu étais si impitoyable.

I had no idea you were so ruthless.

Je n'avais pas idée que tu te sentais ainsi.

I had no idea you felt that way.

Je n'avais pas idée que tu savais danser.

I had no idea you could dance.