Yap.Town

って知らなかったの

didn't know that…?

→ って
phrase Uncommon #13,307
didn't know that…? って introduces the information someone didn't know. The の at the end often makes this a question; the phrase is conversational.
JA: 彼が来るって知らなかったの？
EN: Didn't you know that he was coming?

私がそれをしたくなかったって知らなかったの？

Didn't you know I didn't want to do that?

トムの親戚がオーストラリアにいるって知らなかったの？

Didn't you know Tom has relatives in Australia?

ごめんあなた達のご飯って知らなかったの

Sorry, I didn’t realize that was your food.

— 魔女の宅急便 (1989)

トムがオーストラリア出身だって知らなかったの？

Didn't you know that Tom is from Australia?

トムがフランス語も話すって知らなかったの？

Didn't you know Tom speaks French too?

トムがお金持ちだって知らなかったの？

Didn't you know Tom was rich?

トムがメアリーの彼氏だって知らなかったの？

Didn't you know Tom was Mary's boyfriend?

トムがメアリーより年上だって知らなかったの？

Didn't you know Tom is older than Mary?