3 sentences

1. 铜钉比铁钉好，因为铁会生锈。

   tóng dīng bǐ tiě​dīng hǎo, yīn​wèi tiě huì shēng xiù.

   Copper nails are better than iron nails because the iron rusts.

   Source: UM-Corpus: Spoken

2. 你的刀生锈了。

   nǐ de dāo shēng xiù le.

   Your knife is rusty.

   Source: Tatoeba

3. 院子里甚至有一辆生锈的旧卡车。

   yuàn​zi li shèn​zhì yǒu yī liàng shēng xiù de jiù kǎ​chē.

   There’s even a rusty old truck in the yard.

   Source: CCMatrix