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本を読んだら

when you read a book

→ 本
phrase Rare #38,029
when you read a book 本を読んだら uses the たら conditional form to mean “when,” “after,” or “if” reading a book, depending on context. The subject is omitted and must be inferred.
JA: 本を読んだら、元の場所に戻してください。
EN: When you finish reading the book, please return it to its original place.

違う本を読んだら違う考えが浮かんだ。

Reading a different book gave me a different perspective.

本を読んだら元あった所に返しなさい。

When you finish reading the book, put it back where you found it.

隣に座って本を読んだら迷惑かな？

Would it bother you if I sat next to you and read a book?

— ワンス・アポン・ア・タイム・イン・ハリウッド (2019)

その本を読んだら、もとのところへ置きなさい。

When you finish reading the book, put it back where you found it.