2 sentences for 书 (shū — letter)

1. 书不尽言，并颂台安。

   shū bù jìn yán, bìng sòng tái'ān.

   My letter cannot express everything I wish to say; I wish you peace and health.

   Source: Dong Chinese Dictionary

2. 他收到了朋友托人带回的一封亲笔书。

   tā shōu​dào le péng​you tuō rén dài​huí de yī fēng qīn​bǐ shū.

   He received a handwritten letter brought back by a friend.

   Source: Dong Chinese Dictionary