3 sentences for 君 (jūn — monarch)

1. 这位王子是该国的储君。

   zhè wèi wáng​zǐ shì gāi guó de chǔ jūn.

   The prince is the crown prince of the country.

   Source: Dong Chinese Dictionary

2. 国不可一日无君。

   guó bù kě yī rì wú jūn.

   A country cannot go a single day without a ruler.

   Source: Dong Chinese Dictionary

3. 居庙堂之高则忧其民，处江湖之远则忧其君。

   jū miào​táng zhī gāo zé yōu qí mín, chǔ jiāng​hú zhī yuǎn zé yōu qí jūn.

   When high in court, one worries for the people; when far away in the world, one worries for the ruler.

   Source: Dong Chinese Dictionary