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本を書いた

wrote a book

→ 本
phrase Rare #28,934
wrote a book 本 means “book,” and を marks it as the object of 書いた, the past form of “write.”
JA: 兄は旅行について本を書いた。
EN: My older brother wrote a book about travel.

彼女は訪れた人々について本を書いた。

She wrote a book about the people who visited.

どこかで、誰かがその本を書いたに違いない。

Someone must have written that book somewhere.

本を書いたんだろう？

You wrote the book, didn't you?

— ダーク・プレイス (2015)

彼女は動物に関する本を書いた。

She wrote a book about animals.

本を書いたことがありますか。

Have you ever written a book?

だって、自分で本を書いたなら、それは自分のものだし、自分の名前を載せるはずだ。

I mean, if you wrote a book yourself, it would be yours, and you’d put your name on it.