4 sentences

1. 你是不是偷了我那本旧书？

   nǐ shì​bu​shì tōu le wǒ nà běn jiù​shū?

   Did you steal my old book?

   Source: OpenSubtitles

2. 他有时会买旧书。

   tā yǒu​shí huì mǎi jiù​shū.

   He sometimes buys old books.

   Source: OpenSubtitles

3. 是的，我在找一本书，一本旧书。

   shì​de, wǒ zài zhǎo yī​běn shū, yī​běn jiù​shū.

   Yeah, I'm looking for a book, an old book.

   Source: OpenSubtitles

4. 我六岁时，我发现了一本旧书。

   wǒ liù suì shí, wǒ fā​xiàn le yī​běn jiù​shū.

   When I was six, I found an old book.

   Source: OpenSubtitles