とは知らなかった

didn't know that

→ と
phrase Common #5,623
didn't know that Follows a plain-form statement to express surprise or lack of prior knowledge. とは emphasizes the fact or information being unknown.
JA: 彼女が日本語を話せるとは知らなかった。
EN: I didn't know that she could speak Japanese.

トム菜食主義者とは知らなかったんだ

I didn't know Tom was a vegetarian.

トム自分に密かに思いを寄せる人がいるとは知らなかった

Tom didn't know that someone secretly had feelings for him.

あなたが詩を書くとは知らなかった

I didn’t know you wrote poetry.

トムオーストラリア移住するつもりだとは知らなかった

I didn't know Tom was planning to move to Australia.

トムフランス語を話せるとは知らなかった

I didn't know Tom could speak French.

ルーベンス糖尿病とは知らなかった

I didn't know Rubens had diabetes.

— アイム・スティル・ヒア (2024)

彼が仕事を辞める決めていたとは知らなかった

I didn't know he had decided to quit his job.

私は彼が心臓が弱いとは知らなかった

I didn't know he had a weak heart.

リンゴの木から育つとは知らなかったなぁ

I had no idea apple trees could grow from seeds.

彼女が結婚しているとは知らなかった

I didn't know she was married.

メアリーが私を好きだとは知らなかった

I didn’t know Mary liked me.

きみに付き合ってる人がいるとは知らなかった

I didn't know you were seeing someone.

トムユーモアのセンスがあるとは知らなかった

I didn't know Tom had a sense of humor.

トムフランス語話せるとは知らなかった

I didn't know Tom could speak French.

あなたが会員だったとは知らなかった

I didn't know you were a member.

彼女が病気だとは知らなかったんだ

I didn't know she was sick.

若い頃彼は後に有名になる運命にあるとは知らなかった

When he was young, he had no idea that he was destined to become famous.

リンゴの木から成長するとは知らなかった

I didn't know that apple trees grow from seeds.

彼女に子供がいるとは知らなかった

I didn't know she had children.

トムメアリーいとこ同士とは知らなかった

I didn't know Tom and Mary were cousins.